add viewer healthcheck path

[StekPerepolnen]

Changelog entry

#11020
Return /healthcheck handler for backward compatibility

[github-actions]

⚪ 2024-10-28 19:06:17 UTC Pre-commit check linux-x86_64-release-asan for d68fbe4 has started.
⚪ 2024-10-28 19:06:28 UTC Artifacts will be uploaded here
⚪ 2024-10-28 19:09:24 UTC ya make is running...
🟡 2024-10-28 20:14:32 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?
9261	9113	0	37	18	93

🟢 2024-10-28 20:15:20 UTC Build successful.
🟡 2024-10-28 20:15:48 UTC ydbd size 5.7 GiB changed* by +136.9 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 634dc20	merge: d68fbe4	diff	diff %
ydbd size	6 139 711 072 Bytes	6 139 851 256 Bytes	+136.9 KiB	+0.002%
ydbd stripped size	1 532 097 520 Bytes	1 532 101 168 Bytes	+3.6 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]

⚪ 2024-10-28 19:06:38 UTC Pre-commit check linux-x86_64-relwithdebinfo for d68fbe4 has started.
⚪ 2024-10-28 19:06:48 UTC Artifacts will be uploaded here
⚪ 2024-10-28 19:09:56 UTC ya make is running...
🟡 2024-10-28 19:57:37 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?
14900	13404	0	1	1395	100

⚪ 2024-10-28 19:59:01 UTC ya make is running... (failed tests rerun, try 2)
🟢 2024-10-28 20:11:02 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
101 (only retried tests)	7	0	0	0	94

🟢 2024-10-28 20:11:09 UTC Build successful.
🟢 2024-10-28 20:11:29 UTC ydbd size 2.8 GiB changed* by +74.3 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 634dc20	merge: d68fbe4	diff	diff %
ydbd size	3 033 916 896 Bytes	3 033 993 016 Bytes	+74.3 KiB	+0.003%
ydbd stripped size	480 681 240 Bytes	480 681 496 Bytes	+256 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}