stable-25-3-1: cherry pick PR 27297, PR 28613, PR 29360, PR 29466

[rosik]

Cherry-pick:

• Add compatibility test for InferPDiskSlotCount feature #27297
• Fix segfault when handling ChangeGroupSizeInUnits during VDisk LocalRecovery #28613
• Fix flaky test_pdisk_slot_size_in_units.py #29360
• Fix ydb/tests to conform py2 syntax #29466

[github-actions]

🟢 2025-11-24 16:35:17 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-11-24 14:03:59 UTC Pre-commit check linux-x86_64-relwithdebinfo for 6dd25b0 has started.
⚪ 2025-11-24 14:04:13 UTC Artifacts will be uploaded here
⚪ 2025-11-24 14:07:50 UTC ya make is running...
🟡 2025-11-24 15:38:21 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
38753	36074	0	12	2649	18

⚪ 2025-11-24 15:42:00 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-11-24 16:00:28 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
596 (only retried tests)	574	0	2	2	18

⚪ 2025-11-24 16:00:39 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-11-24 16:16:12 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
559 (only retried tests)	547	0	0	0	12

🟢 2025-11-24 16:16:21 UTC Build successful.
🟢 2025-11-24 16:16:39 UTC ydbd size 2.3 GiB changed* by +1.0 KiB, which is < 100.0 KiB vs stable-25-3-1: OK

ydbd size dash	stable-25-3-1: 848999b	merge: 6dd25b0	diff	diff %
ydbd size	2 436 384 680 Bytes	2 436 385 720 Bytes	+1.0 KiB	+0.000%
ydbd stripped size	521 745 832 Bytes	521 746 216 Bytes	+384 Bytes	+0.000%

^{*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]

⚪ 2025-11-24 14:05:12 UTC Pre-commit check linux-x86_64-release-asan for 6dd25b0 has started.
⚪ 2025-11-24 14:05:26 UTC Artifacts will be uploaded here
⚪ 2025-11-24 14:09:00 UTC ya make is running...
🟡 2025-11-24 16:10:35 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
16042	15602	0	171	256	13

🟢 2025-11-24 16:11:53 UTC Build successful.
🟢 2025-11-24 16:12:17 UTC ydbd size 3.8 GiB changed* by +2.4 KiB, which is < 100.0 KiB vs stable-25-3-1: OK

ydbd size dash	stable-25-3-1: 848999b	merge: 6dd25b0	diff	diff %
ydbd size	4 054 180 192 Bytes	4 054 182 696 Bytes	+2.4 KiB	+0.000%
ydbd stripped size	1 510 982 080 Bytes	1 510 983 296 Bytes	+1.2 KiB	+0.000%

^{*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]

⚪ 2025-11-24 16:31:25 UTC Pre-commit check linux-x86_64-relwithdebinfo for b91f036 has started.
⚪ 2025-11-24 16:31:29 UTC Artifacts will be uploaded here
⚪ 2025-11-24 16:35:10 UTC ya make is running...
🟡 2025-11-24 18:17:53 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
38757	36051	0	8	2677	21

⚪ 2025-11-24 18:21:16 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-11-24 18:36:57 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
845 (only retried tests)	825	0	2	1	17

⚪ 2025-11-24 18:37:09 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-11-24 18:52:04 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
538 (only retried tests)	520	0	0	0	18

🟢 2025-11-24 18:52:13 UTC Build successful.
🟢 2025-11-24 18:52:33 UTC ydbd size 2.3 GiB changed* by +1.0 KiB, which is < 100.0 KiB vs stable-25-3-1: OK

ydbd size dash	stable-25-3-1: 65b91e8	merge: b91f036	diff	diff %
ydbd size	2 436 436 840 Bytes	2 436 437 880 Bytes	+1.0 KiB	+0.000%
ydbd stripped size	521 754 536 Bytes	521 754 920 Bytes	+384 Bytes	+0.000%

^{*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]

⚪ 2025-11-24 16:31:31 UTC Pre-commit check linux-x86_64-release-asan for b91f036 has started.
⚪ 2025-11-24 16:31:36 UTC Artifacts will be uploaded here
⚪ 2025-11-24 16:35:10 UTC ya make is running...
🟡 2025-11-24 19:01:46 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
16046	15558	0	164	310	14

🟢 2025-11-24 19:03:03 UTC Build successful.
🟢 2025-11-24 19:03:28 UTC ydbd size 3.8 GiB changed* by +2.4 KiB, which is < 100.0 KiB vs stable-25-3-1: OK

ydbd size dash	stable-25-3-1: 65b91e8	merge: b91f036	diff	diff %
ydbd size	4 054 269 152 Bytes	4 054 271 632 Bytes	+2.4 KiB	+0.000%
ydbd stripped size	1 511 010 112 Bytes	1 511 011 328 Bytes	+1.2 KiB	+0.000%

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