Fix VDisk compaction race (merge from main #21048)

[alexvru]

Changelog entry

Fix VDisk compaction race

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

This patch fixes vdisk compaction race leading to possible data corruption when two compactions are started concurrently.

[github-actions]

🟢 2025-07-14 11:57:59 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-07-14 12:09:33 UTC Pre-commit check linux-x86_64-relwithdebinfo for 629283b has started.
⚪ 2025-07-14 12:10:20 UTC Artifacts will be uploaded here
⚪ 2025-07-14 12:13:43 UTC ya make is running...
🟡 2025-07-14 13:28:08 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?
20030	18747	0	11	1222	50

⚪ 2025-07-14 13:30:03 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-07-14 13:56:03 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?
100 (only retried tests)	58	0	1	2	39

⚪ 2025-07-14 13:56:17 UTC ya make is running... (failed tests rerun, try 3)
🔴 2025-07-14 14:25:52 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?
72 (only retried tests)	32	0	1	0	39

🟢 2025-07-14 14:26:04 UTC Build successful.

[github-actions]

⚪ 2025-07-14 12:15:00 UTC Pre-commit check linux-x86_64-release-asan for 629283b has started.
⚪ 2025-07-14 12:15:15 UTC Artifacts will be uploaded here
⚪ 2025-07-14 12:18:12 UTC ya make is running...
🟡 2025-07-14 13:36:41 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?
12900	12815	0	24	27	34

⚪ 2025-07-14 13:37:56 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-07-14 13:59:42 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?
124 (only retried tests)	71	0	5	15	33

⚪ 2025-07-14 13:59:51 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-07-14 14:29:32 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?
79 (only retried tests)	37	0	3	6	33

🟢 2025-07-14 14:29:39 UTC Build successful.