Include `BranchRules` to `Gitlab/BoundedContexts`
## Context We have some services inside the `BranchRules` namespace included in the [.rubocop_todo/gitlab/bounded_contexts.yml](https://gitlab.com/gitlab-org/gitlab/-/blob/5630d9adba0380ce7cc0715e4fdcaf838c662b71/.rubocop_todo/gitlab/bounded_contexts.yml#L6-6) for `Gitlab/BoundedContexts`. - Let's create a new bounded context for `BranchRules` in the [bounded_contexts.yml](https://gitlab.com/gitlab-org/gitlab/-/blob/5630d9adba0380ce7cc0715e4fdcaf838c662b71/config/bounded_contexts.yml#L295-295) file. - Clean up the `rubocop:disable Gitlab/BoundedContexts` and excluded files in the `rubocop_todo` file.
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