Remove environments folder webpack entry point

What does this MR do?

Remove environments folder 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

• f3d06efc...b5325655 - 10 commits from branch master
• cec3cb25 - Merge branch 'master' into refactor-environments-folder

Compare with previous version

EE: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4738

changed milestone to %10.6

assigned to @iamphill

approved this merge request

resolved all discussions

merged

mentioned in commit e735ba43

mentioned in commit d4094c39