Remove unused imports in proto

[maximyurchuk]

Changelog entry

Just saw ya make warning and fixed warnings

Changelog category

• Not for changelog (changelog entry is not required)

Additional information

[github-actions]

⚪ 2024-09-06 16:09:01 UTC Pre-commit check linux-x86_64-relwithdebinfo for 3e077fb has started.
⚪ 2024-09-06 16:12:10 UTC ya make is running...
🟡 2024-09-06 17:53:28 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
40801	35351	0	6	5421	23

⚪ 2024-09-06 17:57:19 UTC ya make is running... (failed tests rerun, try 2)
🟢 2024-09-06 18:04:54 UTC Tests successful.

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
38 (only retried tests)	21	0	0	0	17

🟢 2024-09-06 18:05:00 UTC Build successful.
🟢 2024-09-06 18:05:35 UTC ydbd size 8.4 GiB changed* by +2.0 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: e10ef55	merge: 3e077fb	diff	diff %
ydbd size	9 013 808 808 Bytes	9 013 810 880 Bytes	+2.0 KiB	+0.000%
ydbd stripped size	487 307 816 Bytes	487 310 248 Bytes	+2.4 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]

⚪ 2024-09-06 16:09:01 UTC Pre-commit check linux-x86_64-release-clang14 for 3e077fb has started.
⚪ 2024-09-06 16:12:10 UTC ya make is running...
🟢 2024-09-06 16:59:54 UTC Build successful.

[github-actions]

⚪ 2024-09-06 16:09:41 UTC Pre-commit check linux-x86_64-release-asan for 3e077fb has started.
⚪ 2024-09-06 16:13:04 UTC ya make is running...
🔴 2024-09-06 18:58:43 UTC Some tests failed, follow the links below.

Test history | Ya make output

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
11561	11373	0	82	66	40

🟢 2024-09-06 18:59:42 UTC Build successful.
🟢 2024-09-06 19:02:22 UTC ydbd size 5.6 GiB changed* by -3.4 KiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: e10ef55	merge: 3e077fb	diff	diff %
ydbd size	6 029 479 688 Bytes	6 029 476 256 Bytes	-3.4 KiB	-0.000%
ydbd stripped size	1 509 734 544 Bytes	1 509 731 248 Bytes	-3.2 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}