add mysql_lengths to the rest of our indices (#4511)
- add mysql_lengths to the rest of our indices
xu is reporting sqlalchemy issues when starting up his dagster instance. I believe that adding these indices will fix it, but I'm unable to reproduce the problem on our end.
Test Plan: BK, find a repro of the original issue, verify this solves it
Reviewers; prha, alangenfeld
- Tests for mysql fix