25-1: Add saving of the intermediate state of the checksum calculation in import from s3

[pixcc]

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

Баг-фикс в еще не вышедшей фиче под фича-флагом. Нужен чтобы в дальнейшем ее можно было включить без проблем с откатом версии.

Cherry-picked from #15046

[github-actions]

⚪ 2025-02-28 13:24:36 UTC Pre-commit check linux-x86_64-relwithdebinfo for c76ffa4 has started.
⚪ 2025-02-28 13:24:50 UTC Artifacts will be uploaded here
⚪ 2025-02-28 13:28:08 UTC ya make is running...
🟡 2025-02-28 15:12:28 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?
28080	25474	0	6	2464	136

⚪ 2025-02-28 15:15:05 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-02-28 15:36:13 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?
214 (only retried tests)	77	0	1	4	132

⚪ 2025-02-28 15:36:24 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-02-28 15:56:16 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
200 (only retried tests)	65	0	0	4	131

🟢 2025-02-28 15:56:25 UTC Build successful.
🟢 2025-02-28 15:56:46 UTC ydbd size 2.1 GiB changed* by +79.8 KiB, which is < 100.0 KiB vs stable-25-1: OK

ydbd size dash	stable-25-1: d0aa06b	merge: c76ffa4	diff	diff %
ydbd size	2 241 509 384 Bytes	2 241 591 120 Bytes	+79.8 KiB	+0.004%
ydbd stripped size	474 783 992 Bytes	474 799 544 Bytes	+15.2 KiB	+0.003%

^{*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]

⚪ 2025-02-28 13:24:44 UTC Pre-commit check linux-x86_64-release-asan for c76ffa4 has started.
⚪ 2025-02-28 13:24:58 UTC Artifacts will be uploaded here
⚪ 2025-02-28 13:28:07 UTC ya make is running...
🟡 2025-02-28 15:09:55 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?
13829	13757	0	23	9	40

⚪ 2025-02-28 15:11:22 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-02-28 15:31:37 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
110 (only retried tests)	72	0	0	1	37

🟢 2025-02-28 15:31:46 UTC Build successful.
🟡 2025-02-28 15:32:11 UTC ydbd size 3.6 GiB changed* by +138.5 KiB, which is >= 100.0 KiB vs stable-25-1: Warning

ydbd size dash	stable-25-1: d0aa06b	merge: c76ffa4	diff	diff %
ydbd size	3 899 168 880 Bytes	3 899 310 704 Bytes	+138.5 KiB	+0.004%
ydbd stripped size	1 364 771 248 Bytes	1 364 830 896 Bytes	+58.2 KiB	+0.004%

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