Fix proxy crash on duplicate topics in request

[FloatingCrowbar]

Changelog entry

Fix metadataRequest containg same topic multiple times crashing KafkaProxy

Changelog category

• Bugfix

Description for reviewers

...

[github-actions]

⚪ 2025-03-07 14:04:34 UTC Pre-commit check linux-x86_64-release-asan for f9c51a5 has started.
⚪ 2025-03-07 14:04:47 UTC Artifacts will be uploaded here
⚫ 2025-03-07 14:06:00 UTC Check cancelled

[github-actions]

🔴 2025-03-07 14:04:34 UTC The validation of the Pull Request description has failed. Please update the description.

Bugfix requires a linked issue in the changelog entry

[github-actions]

⚪ 2025-03-07 14:07:20 UTC Pre-commit check linux-x86_64-release-asan for ea225da has started.
⚪ 2025-03-07 14:07:35 UTC Artifacts will be uploaded here
⚪ 2025-03-07 14:10:24 UTC ya make is running...
🟡 2025-03-07 15:16:18 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?
11475	11259	0	157	21	38

⚪ 2025-03-07 15:17:20 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-03-07 15:30:41 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?
277 (only retried tests)	233	0	12	1	31

⚪ 2025-03-07 15:30:50 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-03-07 15:43:15 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
79 (only retried tests)	51	0	0	0	28

🟢 2025-03-07 15:43:21 UTC Build successful.
🟢 2025-03-07 15:43:55 UTC ydbd size 3.7 GiB changed* by +3.9 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: e4821cc	merge: ea225da	diff	diff %
ydbd size	3 996 097 640 Bytes	3 996 101 680 Bytes	+3.9 KiB	+0.000%
ydbd stripped size	1 389 147 400 Bytes	1 389 148 552 Bytes	+1.1 KiB	+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]

⚪ 2025-03-07 14:09:43 UTC Pre-commit check linux-x86_64-relwithdebinfo for ea225da has started.
⚪ 2025-03-07 14:10:10 UTC Artifacts will be uploaded here
⚪ 2025-03-07 14:13:32 UTC ya make is running...
🟡 2025-03-07 15:01:14 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?
18730	17395	0	1	1217	117

⚪ 2025-03-07 15:03:28 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-03-07 15:14:49 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
162 (only retried tests)	57	0	0	0	105

🟢 2025-03-07 15:14:59 UTC Build successful.
🟢 2025-03-07 15:15:18 UTC ydbd size 2.1 GiB changed* by +2.2 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: e4821cc	merge: ea225da	diff	diff %
ydbd size	2 294 621 968 Bytes	2 294 624 224 Bytes	+2.2 KiB	+0.000%
ydbd stripped size	480 593 312 Bytes	480 593 760 Bytes	+448 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}