ci: change config.yaml path for nemesis

[PavelEfarinov]

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

To avoid overwriting cluster.yaml changed path for nemesis config to/Berkanavt/nemesis/cfg

Should be merged with https://nda.ya.ru/t/ZdEWPO3g7Jh3pf

Closes #23121

[github-actions]

🟢 2025-09-09 09:55:54 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-09-09 09:59:03 UTC Pre-commit check linux-x86_64-release-asan for 9e58d38 has started.
⚪ 2025-09-09 10:01:02 UTC Artifacts will be uploaded here
⚪ 2025-09-09 10:04:04 UTC ya make is running...
🟡 2025-09-09 10:35:02 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?
575	392	0	16	165	2

🟢 2025-09-09 10:35:14 UTC Build successful.
🟡 2025-09-09 10:35:30 UTC ydbd size 4.0 GiB changed* by +184.8 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 2663e55	merge: 9e58d38	diff	diff %
ydbd size	4 296 036 800 Bytes	4 296 225 984 Bytes	+184.8 KiB	+0.004%
ydbd stripped size	1 489 168 984 Bytes	1 489 254 296 Bytes	+83.3 KiB	+0.006%

^{*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]

⚪ 2025-09-09 10:30:44 UTC Pre-commit check linux-x86_64-relwithdebinfo for 9e58d38 has started.
⚪ 2025-09-09 10:31:06 UTC Artifacts will be uploaded here
⚪ 2025-09-09 10:34:12 UTC ya make is running...
🟢 2025-09-09 10:51:50 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
637	632	0	0	4	1

🟢 2025-09-09 10:51:59 UTC Build successful.
🟢 2025-09-09 10:52:10 UTC ydbd size 2.3 GiB changed* by +76.2 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 181055e	merge: 9e58d38	diff	diff %
ydbd size	2 444 389 808 Bytes	2 444 467 792 Bytes	+76.2 KiB	+0.003%
ydbd stripped size	511 707 048 Bytes	511 719 528 Bytes	+12.2 KiB	+0.002%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}