Move push_rule.rb into the Repositories namespace

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Context

The following discussion from !54113 (merged) should be addressed:

• @pslaughter started a discussion:

  Why did we add this to rubocop_manual_todo.yml?

  Without this, rubocop fails with:

  

  The declarative_policy.rb module tries to resolve this policy class dynamically. For it to do so, the policy class needs to be in the same namespace as the corresponding class. I tried moving it into it's own namespace and use declarative_policy_class on push_rule.rb, but this also didn't work for me 😬