Add "ci_runner_controller_runner_scopings" table

Taka Nishidarequested to merge
add-runner-scoping-table-for-runner-controller into master

What does this MR do and why?

This MR adds a new database table to store the relationships between runner controllers and runners (runner-level scoping).

The implementation creates a new database table to store these relationships, along with the necessary code models to manage them. It also includes proper data validation to ensure the connections are valid, and comprehensive tests to verify everything works correctly.

References

How to set up and validate locally

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