Upsert tags in two queries

[jchristgit]

Before, we had an N+1 query, where each tag would be separately fetched and updated. Instead, first delete any tags we no longer care about, then perform an upsert of all fields except for last_commit, which we want to keep from the existing tag.

This comes with one caveat: on the first update of the tags, the tags list is no longer modified in-place, because mutation is bad, however, the database state is updated accordingly.

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[coveralls]

coverage: 100.0%. remained the same when pulling 996353e08b3970ab74ad12e97de1b26dad1291c1 on upsert-tags-in-three-queries into ad60d0270828367bda3a951222ea666eca2db76b on main.