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

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

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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

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