Hook up per repository router and elector

This adds a config option to enable the per repository elector and router. When the per_repository elector is configured, the per repository primary elector and router are enabled and node manager is disabled.

The node manager is still created and passed as a dependency in Praefect's info and server serivces as they haven't been updated to support repository specific primaries yet.

While the configuration option is added, there are still follow ups to address before the components are safe to use in production. For example, creating repositories is not supported yet until a follow up issue is addressed. The changes introduced here are useful for continued local development of repository specific primaries and features dependent on them such as the variable replication factor.

Related to #3133 (closed)