Revert "Refactor S3Buffer for export so that it can use different combinations of checksums, compression and encryption (#14862)"

[UgnineSirdis]

This reverts commit 499b85e.

Changelog entry

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Description for reviewers

#16873

[github-actions]

🟢 2025-04-22 08:01:51 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-04-22 08:05:38 UTC Pre-commit check linux-x86_64-release-asan for 6e8482b has started.
⚪ 2025-04-22 08:06:15 UTC Artifacts will be uploaded here
⚪ 2025-04-22 08:10:05 UTC ya make is running...
🟡 2025-04-22 09:37:52 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?
12063	11860	0	101	66	36

⚪ 2025-04-22 09:38:54 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-04-22 10:00:19 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?
253 (only retried tests)	163	0	6	52	32

⚪ 2025-04-22 10:00:29 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-04-22 10:21:18 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?
116 (only retried tests)	37	0	5	42	32

🟢 2025-04-22 10:21:25 UTC Build successful.
🟢 2025-04-22 10:21:56 UTC ydbd size 3.6 GiB changed* by +52.8 KiB, which is < 100.0 KiB vs stable-25-1: OK

ydbd size dash	stable-25-1: 5f4b784	merge: 6e8482b	diff	diff %
ydbd size	3 904 908 768 Bytes	3 904 962 816 Bytes	+52.8 KiB	+0.001%
ydbd stripped size	1 366 252 656 Bytes	1 366 262 544 Bytes	+9.7 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]

⚪ 2025-04-22 08:50:38 UTC Pre-commit check linux-x86_64-relwithdebinfo for 6e8482b has started.
⚪ 2025-04-22 08:50:42 UTC Artifacts will be uploaded here
⚪ 2025-04-22 08:53:44 UTC ya make is running...
🟡 2025-04-22 10:07:26 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?
19326	17959	0	6	1232	129

⚪ 2025-04-22 10:09:02 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-04-22 10:30:57 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
214 (only retried tests)	81	0	0	6	127

🟢 2025-04-22 10:31:03 UTC Build successful.
🟢 2025-04-22 10:31:36 UTC ydbd size 2.1 GiB changed* by +34.3 KiB, which is < 100.0 KiB vs stable-25-1: OK

ydbd size dash	stable-25-1: 5f4b784	merge: 6e8482b	diff	diff %
ydbd size	2 244 804 592 Bytes	2 244 839 680 Bytes	+34.3 KiB	+0.002%
ydbd stripped size	475 276 600 Bytes	475 277 432 Bytes	+832 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}