Convert remaining issue board components into ES module syntax
EE port: gitlab-ee!7842
What does this MR do?
Removes the use of window.gl.issueBoards.*
globals to manage the issue boards components.
What are the relevant issue numbers?
Part of: gitlab-org/gitlab-ce#44224 Related to: gitlab-org/gitlab-ce#34371
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides
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