Fix PARTITION_COUNT option name and add tests

[fexolm]

Changelog entry

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Changelog category

• New feature
• Experimental feature
• Improvement
• Performance improvement
• Bugfix
• Backward incompatible change
• Documentation (changelog entry is not required)
• Not for changelog (changelog entry is not required)

Additional information

...

[github-actions]

⚪ 2024-09-10 12:47:58 UTC Pre-commit check linux-x86_64-release-asan for e6e9bb2 has started.
⚪ 2024-09-10 12:48:37 UTC Artifacts will be uploaded here
⚪ 2024-09-10 12:51:50 UTC ya make is running...
🔴 2024-09-10 14:22:28 UTC Some tests failed, follow the links below.

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12824	12745	0	18	33	28

🟢 2024-09-10 14:24:03 UTC Build successful.
🟡 2024-09-10 14:24:30 UTC ydbd size 5.6 GiB changed* by +1.3 MiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: f11c0b2	merge: e6e9bb2	diff	diff %
ydbd size	6 037 343 296 Bytes	6 038 706 488 Bytes	+1.3 MiB	+0.023%
ydbd stripped size	1 511 159 472 Bytes	1 511 287 248 Bytes	+124.8 KiB	+0.008%

^{*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]

⚪ 2024-09-10 12:48:35 UTC Pre-commit check linux-x86_64-relwithdebinfo for e6e9bb2 has started.
⚪ 2024-09-10 12:49:18 UTC Artifacts will be uploaded here
⚪ 2024-09-10 12:52:41 UTC ya make is running...
🟡 2024-09-10 14:05:35 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
75094	61273	0	7	13787	27

⚪ 2024-09-10 14:13:05 UTC ya make is running... (failed tests rerun, try 2)
🟢 2024-09-10 14:24:12 UTC Tests successful.

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
51 (only retried tests)	29	0	0	1	21

🟢 2024-09-10 14:24:20 UTC Build successful.
🟢 2024-09-10 14:25:01 UTC ydbd size 8.4 GiB changed* by -32 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: a7d2186	merge: e6e9bb2	diff	diff %
ydbd size	9 026 353 128 Bytes	9 026 353 096 Bytes	-32 Bytes	-0.000%
ydbd stripped size	487 744 168 Bytes	487 744 168 Bytes	0 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]

⚪ 2024-09-10 12:49:06 UTC Pre-commit check linux-x86_64-release-clang14 for e6e9bb2 has started.
⚪ 2024-09-10 12:49:16 UTC Artifacts will be uploaded here
⚪ 2024-09-10 12:52:05 UTC ya make is running...
🟢 2024-09-10 13:02:20 UTC Build successful.