Adds feedback banner on runner admin page

What does this MR do and why?

Implements #370855 (closed)

We are making layout improvements to the admin runners view and want to collect feedback from users about these changes.

We are adding a banner to link to an issue to leave feedback.

Screenshots or screen recordings

See more about the new layout at: !95617 (merged)

How to set up and validate locally

1. Enable the new layout

   Feature.enable(:runner_list_stacked_layout_admin)

2. Visit admin runners page at Admin -> Runners (e.g. http://gdk.test:3000/admin/runners)

3. Confirm the banner is present

Group Runners:

1. Enable the new layout

   Feature.enable(:runner_list_stacked_layout)

2. Go to Group -> CI/CD -> Runners

3. Confirm the banner is present

**Note:** If you dismiss the banner you can recover it:

Delete the following entry from your browser's local storage:

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #370855 (closed)