fix parsing of s3 settings on CS

[swalrus1]

• fix s3 settings conversion
• add unit-test

Changelog entry

Fix parsing S3 settings on CS

Changelog category

• Bugfix

Additional information

...

[github-actions]

⚪ 2024-12-20 18:31:38 UTC Pre-commit check linux-x86_64-release-asan for cfcb17f has started.
⚪ 2024-12-20 18:31:50 UTC Artifacts will be uploaded here
⚪ 2024-12-20 18:34:39 UTC ya make is running...
🟡 2024-12-20 19:34:07 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12178	12104	0	16	8	50

🟢 2024-12-20 19:35:49 UTC Build successful.
🟢 2024-12-20 19:36:15 UTC ydbd size 3.6 GiB changed* by +3.1 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: d2e4bb8	merge: cfcb17f	diff	diff %
ydbd size	3 866 288 592 Bytes	3 866 291 776 Bytes	+3.1 KiB	+0.000%
ydbd stripped size	1 350 523 280 Bytes	1 350 524 048 Bytes	+768 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]

⚪ 2024-12-20 18:32:11 UTC Pre-commit check linux-x86_64-relwithdebinfo for cfcb17f has started.
⚪ 2024-12-20 18:32:25 UTC Artifacts will be uploaded here
⚪ 2024-12-20 18:35:20 UTC ya make is running...
🟡 2024-12-20 19:25:57 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?
19404	17869	0	4	1415	116

⚪ 2024-12-20 19:27:52 UTC ya make is running... (failed tests rerun, try 2)
🟢 2024-12-20 19:40:01 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
166 (only retried tests)	56	0	0	0	110

🟢 2024-12-20 19:40:10 UTC Build successful.
🟢 2024-12-20 19:40:27 UTC ydbd size 2.1 GiB changed* by +1.4 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: d2e4bb8	merge: cfcb17f	diff	diff %
ydbd size	2 235 568 584 Bytes	2 235 569 984 Bytes	+1.4 KiB	+0.000%
ydbd stripped size	477 930 768 Bytes	477 931 152 Bytes	+384 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}