Migrate Redis keys in RepositoryCache to the structured format
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* Epic: https://gitlab.com/groups/gitlab-org/-/epics/9313
* Discussion: https://gitlab.com/gitlab-org/gitlab/-/issues/378189#note_1166190924
[`RepositoryCache`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/repository_cache.rb) is responsible for majority of repository related caches (branches, tags, avatars, ...)
### Proposal
Update all `cache_method` keys to follow the new format:
Example
```
cache:gitlab:source_code_management:Repository#has_ambiguous_refs?:project-1
```
### Notes
* `source_code_management` can be a default value, because the whole `RepositoryCache` belongs to `source_code_management` feature category.
* We keep `cache:gitlab` for now, the migration to `gl:` will take place after.
issue