Draft: Added phase_index property to experiment fragment. Updated related schemas

Santiago Facirequested to merge
T429059/update-experiment-phase_index into master

Test Kitchen API has included a new property called phase_index that indicates the phase in which the related experiment is running. That property will be included in any submitted event so related fragment and schemas need to be updated accordingly: web/base, web/base_with_ip and app/base. This MR does that

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)
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  • N/A If this introduces a new or upgraded MEDIUM or HIGH risk level, @sguebo added as a reviewer (please check @sguebo calendar for availability and find an alternate if @sguebo 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: T429059

Edited by Santiago Faci

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