Aravinth Manivannan ade41f3f04
tests: add coverage for models migration helpers (#18162)
They were previously not covered at all, either by integration tests or unit tests.

This PR also fixes a bug where the `num_comments` field was incorrectly set to include all types of comments.

It sets num_closed_issues: 0 as default in milestone unit test fixtures. If they are not set, Incr("num_closed_issues") will be a noop because the field is null.
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