Add loader for pipeline actions

Briley Sandlinrequested to merge
bs-papercuts-9-24 into master

What does this MR do and why?

resolves #480500 (closed)

This was coded as part of a pair programming session with @sunjungp for PA team papercuts

Add loader for pipeline actions

Screenshots or screen recordings

Full screen Mobile
actions_loader actions_loader_mobile

How to set up and validate locally

  1. Visit an MR with pipelines
  2. Click "Run Pipeline"
  3. You should see the loading row with a loader in the actions cell

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