Stable-25-1-2 Fix snapshots

[nikvas0]

Changelog entry

Fixes #20709. Need to acquire snapshot for dependant reads even in RW transaction.

Changelog category

• Bugfix

Description for reviewers

#20652

[github-actions]

🟢 2025-07-07 10:55:26 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-07-07 10:51:21 UTC Pre-commit check linux-x86_64-release-asan for e7f2f52 has started.
⚪ 2025-07-07 10:51:33 UTC Artifacts will be uploaded here
⚪ 2025-07-07 10:54:27 UTC ya make is running...
🟡 2025-07-07 12:12:44 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12425	12273	0	44	68	40

⚪ 2025-07-07 12:13:50 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-07-07 12:34:40 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
192 (only retried tests)	91	0	8	57	36

⚪ 2025-07-07 12:34:49 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-07-07 12:54:38 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
133 (only retried tests)	39	0	8	51	35

🟢 2025-07-07 12:54:46 UTC Build successful.
🟢 2025-07-07 12:55:17 UTC ydbd size 3.7 GiB changed* by +9.6 KiB, which is < 100.0 KiB vs stable-25-1-2: OK

ydbd size dash	stable-25-1-2: 5c49af9	merge: e7f2f52	diff	diff %
ydbd size	3 925 671 488 Bytes	3 925 681 344 Bytes	+9.6 KiB	+0.000%
ydbd stripped size	1 372 708 560 Bytes	1 372 714 512 Bytes	+5.8 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]

⚪ 2025-07-07 10:51:33 UTC Pre-commit check linux-x86_64-relwithdebinfo for e7f2f52 has started.
⚪ 2025-07-07 10:51:43 UTC Artifacts will be uploaded here
⚪ 2025-07-07 10:54:37 UTC ya make is running...
🟡 2025-07-07 11:54:29 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?
19484	18213	0	3	1206	62

⚪ 2025-07-07 11:56:19 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-07-07 12:16:27 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
124 (only retried tests)	63	0	0	0	61

🟢 2025-07-07 12:16:34 UTC Build successful.
🟢 2025-07-07 12:16:53 UTC ydbd size 2.1 GiB changed* by +3.0 KiB, which is < 100.0 KiB vs stable-25-1-2: OK

ydbd size dash	stable-25-1-2: 5c49af9	merge: e7f2f52	diff	diff %
ydbd size	2 256 785 232 Bytes	2 256 788 336 Bytes	+3.0 KiB	+0.000%
ydbd stripped size	477 635 608 Bytes	477 636 568 Bytes	+960 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}