Fix improperly typed enums] ax/metrics/tests [B]

[MaggieMoss]

Differential Revision: D66200838

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66200838

[codecov-commenter]

Codecov Report

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

Project coverage is 95.74%. Comparing base (a0f3b45) to head (6296a6e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3085 +/- ## ========================================== - Coverage 95.74% 95.74% -0.01% ========================================== Files 488 488 Lines 49728 49729 +1 ========================================== - Hits 47613 47612 -1 - Misses 2115 2117 +2 ```

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[facebook-github-bot]

This pull request has been merged in facebook/Ax@69df6c3701fa7bd02f72d0167f25d2cb5be970b8.