Events: remove unused classes

[maximyurchuk]

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[github-actions]

⚪ 2024-07-16 13:50:56 UTC Pre-commit check for e804df8 has started.
⚪ 2024-07-16 13:54:29 UTC Build+Tests linux-x86_64-release-clang14 is running...
🟢 2024-07-16 14:35:32 UTC Build successful.

[github-actions]

⚪ 2024-07-16 13:51:37 UTC Pre-commit check for e804df8 has started.
⚪ 2024-07-16 13:54:46 UTC Build+Tests linux-x86_64-release-asan is running...
🟢 2024-07-16 16:36:24 UTC Build successful.
🔴 2024-07-16 16:39:09 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
13469	12865	0	89	332	183

🟢 2024-07-16 16:39:56 UTC ydbd size 5.2 GiB changed* by +28.6 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: a037131	merge: e804df8	diff	diff %
ydbd size	5 549 082 616 Bytes	5 549 111 880 Bytes	+28.6 KiB	+0.001%
ydbd stripped size	1 194 978 736 Bytes	1 194 987 024 Bytes	+8.1 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]

⚪ 2024-07-16 13:52:19 UTC Pre-commit check for e804df8 has started.
⚪ 2024-07-16 13:55:24 UTC Build+Tests linux-x86_64-relwithdebinfo is running...
🟢 2024-07-16 16:33:52 UTC Build successful.
🔴 2024-07-16 16:45:41 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
74608	61155	0	5	13430	18

🟢 2024-07-16 16:46:26 UTC ydbd size 8.0 GiB changed* by +38.0 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: a037131	merge: e804df8	diff	diff %
ydbd size	8 642 916 472 Bytes	8 642 955 352 Bytes	+38.0 KiB	+0.000%
ydbd stripped size	470 538 624 Bytes	470 540 672 Bytes	+2.0 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}