Fix cluster rejoin circuit in IC

[alexvru]

Changelog entry

Fix cluster rejoin circuit in IC

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

This patch fixes incorrect behaviour when some nodes from disconnected cluster are returning after other ones and incorrectly retain the old config.

[github-actions]

⚪ 2025-09-05 06:58:32 UTC Pre-commit check linux-x86_64-release-asan for b12e9dd has started.
⚪ 2025-09-05 06:58:46 UTC Artifacts will be uploaded here
⚪ 2025-09-05 07:02:03 UTC ya make is running...
🟡 2025-09-05 08:51:36 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?
15198	14772	0	116	286	24

🟢 2025-09-05 09:23:19 UTC Build successful.

[github-actions]

⚪ 2025-09-05 07:00:50 UTC Pre-commit check linux-x86_64-relwithdebinfo for b12e9dd has started.
⚪ 2025-09-05 07:01:06 UTC Artifacts will be uploaded here
⚪ 2025-09-05 07:04:35 UTC ya make is running...
🟡 2025-09-05 08:21:20 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?
37805	35035	0	3	2725	42

⚪ 2025-09-05 08:24:34 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-09-05 08:37:09 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
577 (only retried tests)	551	0	0	0	26

🟢 2025-09-05 08:37:21 UTC Build successful.