Improve commit flow in Web IDE

What does this MR do?

This improves the commit actions in the commit panel of the Web IDE by doing the following:

• Always showing the stage/unstage/discard buttons instead of only showing on hover
• Always shows the bulk stage/unstage button when there are files in the relevant list, otherwise it gets hidden
• Changes the rendering from the path to the name. The path now gets shown in a tooltip but only when the path doesn't match the name otherwise we end up with duplicate output

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/46122