Fix spacing in file path header

What does this MR do and why?

• Adjust spacing in file header
• Use small copy to clipboard button

Screenshots or screen recordings

Before	After

How to set up and validate locally

• View file blob (ie http://gdk.test:3000/gitlab-org/gitlab-test/-/blob/2a7aea2c0c68cdfacf023842657d68f356faac54/PROCESS.md)
• Comment out v-if="!glFeatures.directoryCodeDropdownUpdates" to see copy to clipboard button (also on prod)

Links

• ✂️ UX Paper Cuts 18.2 → USAT & bug::ux (#513103 - closed)