Delete/update metrics related controller and API helpers
What does this MR do and why?
Aids in deleting code related to #397138 (closed)
Updates/deletes controllers, specs, API helpers.
Screenshots or screen recordings
NA
How to set up and validate locally
Everything else should just work and pipeline should be
There should not be any code left from the changed files that relates to metrics.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #397138 (closed)