Add docs for csv download
requested to merge 64950-move-download-csv-button-functionality-in-metrics-dashboard-cards-into-the-dropdown into master
What does this MR do?
These are the docs for #64950 (closed)
Conformity
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[Documentation created/updated](https://docs.gitlab.com/ee/development/documentation/feature-
Closes #66291 (closed)
Edited by Laura Montemayor