Remove commit_pipelines webpack entry point

What does this MR do?

Remove commit_pipelines webpack entry point

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

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/41341

mentioned in issue #41341 (closed)

added 11 commits

• 4ebfa4b0...b5325655 - 10 commits from branch master
• c737646d - Merge branch 'master' into refactor-pipelines-list

Compare with previous version

EE: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4737

assigned to @iamphill

unmarked as a Work In Progress

approved this merge request

resolved all discussions

merged

mentioned in commit a4885b8f

mentioned in merge request !15695 (merged)

mentioned in commit 57e7b270