add switch for explicit compaction after defragmentation

[VPolka]

Changelog entry

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Changelog category

• Improvement

Description for reviewers

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[github-actions]

⚪ 2025-07-01 22:50:08 UTC Pre-commit check for 1f7df2f has started.
⚪ 2025-07-01 22:53:09 UTC Build linux-x86_64-release-asan is running...
🟢 2025-07-01 23:21:24 UTC Build successful.
⚪ 2025-07-01 23:21:45 UTC Tests are running...
🔴 2025-07-02 01:43:18 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
11921	11761	0	77	33	50

🟡 2025-07-02 01:44:18 UTC ydbd size 5.6 GiB changed* by +103.8 KiB, which is >= 100.0 KiB vs stream-nb-24-4: Warning

ydbd size dash	stream-nb-24-4: e1c9600	merge: 1f7df2f	diff	diff %
ydbd size	6 040 724 744 Bytes	6 040 831 016 Bytes	+103.8 KiB	+0.002%
ydbd stripped size	1 510 960 096 Bytes	1 510 981 440 Bytes	+20.8 KiB	+0.001%

^{*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]

⚪ 2025-07-01 22:50:16 UTC Pre-commit check for 1f7df2f has started.
⚪ 2025-07-01 22:53:15 UTC Build linux-x86_64-relwithdebinfo is running...
🟢 2025-07-01 23:37:44 UTC Build successful.
⚪ 2025-07-01 23:38:01 UTC Tests are running...
🔴 2025-07-02 01:35:44 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
40603	35278	0	46	5241	38

🟢 2025-07-02 01:36:48 UTC ydbd size 8.3 GiB changed* by +91.2 KiB, which is < 100.0 KiB vs stream-nb-24-4: OK

ydbd size dash	stream-nb-24-4: e1c9600	merge: 1f7df2f	diff	diff %
ydbd size	8 910 874 168 Bytes	8 910 967 552 Bytes	+91.2 KiB	+0.001%
ydbd stripped size	485 703 112 Bytes	485 711 400 Bytes	+8.1 KiB	+0.002%

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