Add branch rules details to the list of branch rules

Description

In #362217 (closed) we've added the ability to list branch rules under Repository > Settings.

Currently, we only expose the name in the GraphQL endpoint, but the design requires us to also list branch rule details related to each branch rule.

Scope

Looking at branch_rule_type.rb right now we only expose name. We should also expose the branch rule details and render in on the frontend accordingly.

This issue addresses the sections marked in red:

Example (GraphQL reponse):

[{
  name: 'test-*', // branch or wildcard name
  isDefault: true, // whether on not it is the default branch
  isProtected: true, // whether a protection has been added to the branch
  details: ['2 matching branches', 'Requires CODEOWNERS approval', '2 status checks'], // details/summary of the protections
}]

Testing

Regression testing with full run package-and-test recommended