Draft: Added overridden as valid value for experiment.sampling_unit

Santiago Facirequested to merge
T433711-overridden-sampling-unit into master

Added overridden as a valid value for experiment.sampling_unit (so far only mw-user, edge-unique and session were valid). Now, with T433711 overridden experiment will be able to send events (when running on beta cluster and to the beta cluster stream) so a new valid value is needed for this new case. So far we used that value but it wasn't added to the schema because overridden experiment couldn't send events.

Merge request checklist

  • Phabricator task(s) associated with this change added to commit message (use Bug: TASK_NUMBER on line at end of commit message)
  • wikitech:Event Platform/Instrumentation How To#Writing MediaWiki instrumentation code was followed for the schema(s) in the merge request. This includes if this merge request entails a new MEDIUM or HIGH risk schema, or if this merge request entails a schema alteration that increases the risk level based on Data Collection Guidelines.
  • N/A If this introduces a new or upgraded MEDIUM or HIGH risk level, @rscout added as a reviewer (please check @rscout calendar for availability and find an alternate if @rscout is out).
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  • N/A Links to any other data specifications, such as a measurement plan or instrumentation specification if pertinent. Links to related code / Gerrit/GitLab patch pertinent to this schema change if it exists yet; if it doesn't exist yet that is okay and the merge requester should be sure to ensure reachability for that code via the commit message's referenced Phabricator task(s) later on. Please add links for any data specifications and relevant patches below this checkbox line if you have them.

Bug: T433711

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