Change CI template linter textarea with Ace Editor.

What does this MR do?

Changes CI template linter textarea with Ace Editor.

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

Yes. It's my first MR so everything should be reviewed.

Why was this MR needed?

There was a simple textarea it was short and it was hard to change template and also result view was broken.

Screenshots (if relevant)

Before

After

Responsive

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 it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #24179 (closed)

Closes #19701 (closed)