Geo: Implement "container_repositories_max_capacity" for SSF

This issue is similar to #372488 (closed) but for Container Repositories.

The SSF currently doesn't allow setting up separate concurrency limits for every datatype. The parameter container_repositories_max_capacity is already in our database and has appropriate UI elements. We process it in Geo::RepositoryRegistrySyncWorker#max_capacity temporarily by taking into account its value, however, it should only affect the container repository replicator capacity.

A related issue with the discussion #372444 (closed)