Free some unused reserved top-level words.

What does this MR do?

It frees up reserved routes for our used to use.

We also reserve the names of files that are checked-in in the public folder, those would already cause weird behavior. So adding them prevents creating these groups.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests
  • Added for this feature/bug
  • All builds are passing

What are the relevant issue numbers?

Closes #35053 (closed)