Remove project_title additions from builds and environments

What does this MR do?

Removed soon-to-be un-needed project title additions from builds and environments.

This MR depends on !5998 (merged), which introduces subnav to these pages. Without it we're just removing a useful link.

Are there points in the code the reviewer needs to double check?

@iamphill Is this right of me? One of these still exists in projects/artifacts/browse, I'm not sure whether to fix the issue with project_title, which already has some issues with its chevron, or just remove it as it will soon be redundant.

Why was this MR needed?

Screenshots (if relevant)

BEFORE:

AFTER:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #21764 (closed)