Switch incremental backup cdc mode back to Update

[Enjection]

Changelog entry

...

Changelog category

• New feature
• Experimental feature
• Improvement
• Performance improvement
• User Interface
• Bugfix
• Backward incompatible change
• Documentation (changelog entry is not required)
• Not for changelog (changelog entry is not required)

Description for reviewers

...

[github-actions]

⚪ 2025-09-05 10:47:17 UTC Pre-commit check linux-x86_64-relwithdebinfo for 814c8ea has started.
⚪ 2025-09-05 10:47:32 UTC Artifacts will be uploaded here
⚪ 2025-09-05 10:51:17 UTC ya make is running...
⚫ 2025-09-05 11:06:53 UTC Check cancelled

[github-actions]

⚪ 2025-09-05 10:47:24 UTC Pre-commit check linux-x86_64-release-asan for 814c8ea has started.
⚪ 2025-09-05 10:47:38 UTC Artifacts will be uploaded here
⚪ 2025-09-05 10:51:24 UTC ya make is running...
⚫ 2025-09-05 11:06:48 UTC Check cancelled

[github-actions]

🟢 2025-09-05 10:47:32 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-09-05 11:11:30 UTC Pre-commit check linux-x86_64-release-asan for 613961a has started.
⚪ 2025-09-05 11:11:57 UTC Artifacts will be uploaded here
⚪ 2025-09-05 11:16:42 UTC ya make is running...
🟡 2025-09-05 13:57:48 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
17367	16858	0	134	347	28

🟢 2025-09-05 13:59:22 UTC Build successful.
🟡 2025-09-05 13:59:46 UTC ydbd size 4.0 GiB changed* by +123.5 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 691cda0	merge: 613961a	diff	diff %
ydbd size	4 291 117 776 Bytes	4 291 244 288 Bytes	+123.5 KiB	+0.003%
ydbd stripped size	1 487 627 032 Bytes	1 487 672 120 Bytes	+44.0 KiB	+0.003%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-09-05 11:14:41 UTC Pre-commit check linux-x86_64-relwithdebinfo for 613961a has started.
⚪ 2025-09-05 11:14:57 UTC Artifacts will be uploaded here
⚪ 2025-09-05 11:18:58 UTC ya make is running...
🟡 2025-09-05 13:23:36 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
40121	37359	0	4	2716	42

⚪ 2025-09-05 13:27:19 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-09-05 13:43:16 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
456 (only retried tests)	427	0	3	0	26

⚪ 2025-09-05 13:43:32 UTC ya make is running... (failed tests rerun, try 3)
🔴 2025-09-05 13:59:57 UTC Some tests failed, follow the links below.

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
288 (only retried tests)	262	0	3	0	23

🟢 2025-09-05 14:00:05 UTC Build successful.
🟢 2025-09-05 14:00:27 UTC ydbd size 2.3 GiB changed* by +76.7 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 691cda0	merge: 613961a	diff	diff %
ydbd size	2 441 654 408 Bytes	2 441 732 928 Bytes	+76.7 KiB	+0.003%
ydbd stripped size	511 187 176 Bytes	511 200 040 Bytes	+12.6 KiB	+0.003%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-09-08 10:48:40 UTC Pre-commit check linux-x86_64-release-asan for 27e2ec6 has started.
⚪ 2025-09-08 10:48:53 UTC Artifacts will be uploaded here
⚪ 2025-09-08 10:52:39 UTC ya make is running...
🟡 2025-09-08 13:36:52 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
17391	16921	0	127	317	26

🟢 2025-09-08 13:38:21 UTC Build successful.
🟡 2025-09-08 13:38:45 UTC ydbd size 4.0 GiB changed* by +119.6 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 30acad6	merge: 27e2ec6	diff	diff %
ydbd size	4 295 809 128 Bytes	4 295 931 560 Bytes	+119.6 KiB	+0.003%
ydbd stripped size	1 489 095 064 Bytes	1 489 136 056 Bytes	+40.0 KiB	+0.003%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-09-08 10:50:23 UTC Pre-commit check linux-x86_64-relwithdebinfo for 27e2ec6 has started.
⚪ 2025-09-08 10:50:37 UTC Artifacts will be uploaded here
⚪ 2025-09-08 10:54:33 UTC ya make is running...
🟡 2025-09-08 12:59:02 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
40153	37390	0	5	2723	35

⚪ 2025-09-08 13:02:36 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-09-08 13:16:53 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
504 (only retried tests)	472	0	1	4	27

⚪ 2025-09-08 13:17:05 UTC ya make is running... (failed tests rerun, try 3)
🔴 2025-09-08 13:40:02 UTC Some tests failed, follow the links below.

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
482 (only retried tests)	459	0	1	0	22

🟢 2025-09-08 13:40:11 UTC Build successful.
🟢 2025-09-08 13:40:33 UTC ydbd size 2.3 GiB changed* by +80.7 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 30acad6	merge: 27e2ec6	diff	diff %
ydbd size	2 444 258 536 Bytes	2 444 341 136 Bytes	+80.7 KiB	+0.003%
ydbd stripped size	511 664 072 Bytes	511 681 000 Bytes	+16.5 KiB	+0.003%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[Enjection]

Logic in serializer could be simplified, but don't mind for now

[github-actions]

⚪ 2025-09-08 16:02:24 UTC Pre-commit check linux-x86_64-relwithdebinfo for 9cc1f18 has started.
⚪ 2025-09-08 16:02:39 UTC Artifacts will be uploaded here
⚪ 2025-09-08 16:06:40 UTC ya make is running...
🟢 2025-09-08 17:27:09 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
40155	37402	0	0	2720	33

🟢 2025-09-08 17:30:42 UTC Build successful.
🟢 2025-09-08 17:30:59 UTC ydbd size 2.3 GiB changed* by +77.1 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 40e102c	merge: 9cc1f18	diff	diff %
ydbd size	2 444 227 848 Bytes	2 444 306 752 Bytes	+77.1 KiB	+0.003%
ydbd stripped size	511 662 664 Bytes	511 676 552 Bytes	+13.6 KiB	+0.003%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-09-08 16:02:49 UTC Pre-commit check linux-x86_64-release-asan for 9cc1f18 has started.
⚪ 2025-09-08 16:03:02 UTC Artifacts will be uploaded here
⚪ 2025-09-08 16:07:00 UTC ya make is running...
🟡 2025-09-08 18:09:44 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
17393	16840	0	140	383	30

🟢 2025-09-08 18:11:16 UTC Build successful.
🟡 2025-09-08 18:11:41 UTC ydbd size 4.0 GiB changed* by +121.9 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 40e102c	merge: 9cc1f18	diff	diff %
ydbd size	4 295 736 192 Bytes	4 295 860 976 Bytes	+121.9 KiB	+0.003%
ydbd stripped size	1 489 078 776 Bytes	1 489 124 504 Bytes	+44.7 KiB	+0.003%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}