Add noData empty state to Prometheus graphs
What does this MR do?
Adds an empty state to the prometheus graphs in cases where there are no graphs to display. Currently it just shows an empty page with no useful information.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
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Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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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-qamanual pipeline job)
What are the relevant issue numbers?
Closes: gitlab-org/gitlab-ce#42558