[KQP] Fix flaky tests for BATCH operations with gvit's single partitioning optimizations

[dahbka-lis]

Changelog entry

...

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

...

[github-actions]

⚪ 2025-08-28 23:15:12 UTC Pre-commit check linux-x86_64-relwithdebinfo for 06beb81 has started.
⚪ 2025-08-28 23:15:18 UTC Artifacts will be uploaded here
⚪ 2025-08-28 23:18:47 UTC ya make is running...
🟡 2025-08-29 00:37:16 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?
37810	35063	0	2	2712	33

⚪ 2025-08-29 00:40:27 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-08-29 00:55:09 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
244 (only retried tests)	219	0	0	0	25

🟢 2025-08-29 00:55:19 UTC Build successful.
🟢 2025-08-29 00:55:41 UTC ydbd size 2.3 GiB changed* by +9.1 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 5873801	merge: 06beb81	diff	diff %
ydbd size	2 435 553 872 Bytes	2 435 563 160 Bytes	+9.1 KiB	+0.000%
ydbd stripped size	510 180 744 Bytes	510 182 664 Bytes	+1.9 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]

🟢 2025-08-28 23:15:48 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-08-28 23:20:49 UTC Pre-commit check linux-x86_64-release-asan for 06beb81 has started.
⚪ 2025-08-28 23:20:55 UTC Artifacts will be uploaded here
⚪ 2025-08-28 23:24:12 UTC ya make is running...
🟡 2025-08-29 01:22:19 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?
15181	14738	0	94	313	36

🟢 2025-08-29 01:23:42 UTC Build successful.
🟢 2025-08-29 01:24:10 UTC ydbd size 4.0 GiB changed* by -1.6 KiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 5873801	merge: 06beb81	diff	diff %
ydbd size	4 280 622 304 Bytes	4 280 620 712 Bytes	-1.6 KiB	-0.000%
ydbd stripped size	1 484 690 744 Bytes	1 484 692 216 Bytes	+1.4 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}