Add clusters with replicas from all replica groups

[tavplubix]

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• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

If "replica group" is configured for a Replicated database, automatically create a cluster that includes replicas from all groups.

Closes #62725

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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[robot-ch-test-poll4]

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[sichenzhao]

should it just return regular getClusterImpl when we accidentally call tryGetAllGroups on a clickhouse instance without replicaGroup?

[tavplubix]

I wanted to avoid creating all_groups clusters (and polluting system.clusters) on instances with no replica group. It's hard to call it accidentally, although it's possible to specify smth like all_groups.default as a cluster name in some query on an instance without replica groups. The current implementation throws "unknow cluster" in this case, but I can change it and return regular cluster

[serxa]

Maybe add a small test?

[tavplubix]

AST fuzzer (debug) - #56640
Integration tests (aarch64) [5/6] - #64451
Stress test (debug) - #64936
Stress test (msan) - #64932

[sichenzhao]

fixed this too https://github.com/ClickHouse/data-plane-application/issues/9804