TPortionInfo::GetRecordsCount speed up

[ivanmorozov333]

• Performance improvement

[github-actions]

⚪ 2024-09-23 08:48:09 UTC Pre-commit check linux-x86_64-release-asan for cef2df9 has started.
⚪ 2024-09-23 08:48:13 UTC Artifacts will be uploaded here
⚪ 2024-09-23 08:51:01 UTC ya make is running...
🔴 2024-09-23 10:47:09 UTC Some tests failed, follow the links below.

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
10425	10167	0	65	71	122

🟢 2024-09-23 10:48:04 UTC Build successful.
🟢 2024-09-23 10:48:37 UTC ydbd size 5.6 GiB changed* by +560 Bytes, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 29fff7e	merge: cef2df9	diff	diff %
ydbd size	6 064 150 936 Bytes	6 064 151 496 Bytes	+560 Bytes	+0.000%
ydbd stripped size	1 516 845 488 Bytes	1 516 846 384 Bytes	+896 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]

⚪ 2024-09-23 08:48:10 UTC Pre-commit check linux-x86_64-release-clang14 for cef2df9 has started.
⚪ 2024-09-23 08:48:13 UTC Artifacts will be uploaded here
⚪ 2024-09-23 08:51:09 UTC ya make is running...
🟢 2024-09-23 09:01:08 UTC Build successful.

[github-actions]

⚪ 2024-09-23 08:49:06 UTC Pre-commit check linux-x86_64-relwithdebinfo for cef2df9 has started.
⚪ 2024-09-23 08:49:09 UTC Artifacts will be uploaded here
⚪ 2024-09-23 08:52:04 UTC ya make is running...
🟡 2024-09-23 09:56:45 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
14865	13222	0	7	1603	33

⚪ 2024-09-23 09:58:17 UTC ya make is running... (failed tests rerun, try 2)
🟢 2024-09-23 10:10:08 UTC Tests successful.

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
278 (only retried tests)	179	0	0	8	91

🟢 2024-09-23 10:10:16 UTC Build successful.
🟢 2024-09-23 10:11:42 UTC ydbd size 8.4 GiB changed* by -9.6 KiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 29fff7e	merge: cef2df9	diff	diff %
ydbd size	9 046 426 584 Bytes	9 046 416 784 Bytes	-9.6 KiB	-0.000%
ydbd stripped size	489 498 856 Bytes	489 498 792 Bytes	-64 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}