Add provide feedback button for the repository file tree browser

What does this MR do and why?

Adds a button with a link to the feedback issue

References

#581260

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Navigate to a directory in a repository
2. A "Provide feedback" should render towards the bottom of the file tree browser
3. Clicking the button should open the feedback issue in a new tab

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #581260