Log experiment time_created so we can backfill missed events

[danielcohenlive]

Summary: Log experiment creation time so we can backfill creation events if we ever miss any

Differential Revision: D66022710

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66022710

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.70%. Comparing base (7b671dc) to head (c1dccef).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3078   +/-   ##
=======================================
  Coverage   95.69%   95.70%           
=======================================
  Files         488      488           
  Lines       49510    49512    +2     
=======================================
+ Hits        47381    47383    +2     
  Misses       2129     2129           

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66022710