remove webpack bundle from boards page

What does this MR do?

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

EE MR LINK

Does this MR meet the acceptance criteria?

• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

#41341 (closed)

added 170 commits

• edb2caa1...ea14c1e6 - 169 commits from branch master
• 339d2ff9 - Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce into psimyn-webpack-bundle-boards

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added 1 commit

• 376d95f7 - remove unused import

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Unassigning from this

closed