Clean metrics/dashboard/* workers and update specs
What does this MR do and why?
Aids in cleaning up files mentioned in #397141 (closed)
Worker classes are removed as per direction mentioned in https://docs.gitlab.com/ee/development/sidekiq/compatibility_across_updates.html#removing-worker-classes
Screenshots or screen recordings
NA
How to set up and validate locally
Stuff should just work without these files.
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 #397141 (closed)
Edited by Rajendra Kadam