Resolve "Technical debt: `Service#disabled_title` no longer used and is left dangling in `services/_form.html.haml`"

What does this MR do?

Removes unsused disabled_title variable assignment from a view

Why was this MR needed?

#43522 (closed) - The variable isn't used in that view

Does this MR meet the acceptance criteria?

• Review
  • Has been reviewed by Frontend
  • Has been reviewed by Backend

What are the relevant issue numbers?

First step in #43522 (closed)

Closes #43522 (closed)