- Rewrite `UpdateCommentsMigrationsByType` to not use `WHERE IN` as
that's a performance diaster for MariaDB, it now use batching to query
the the relevant comment IDs via JOINs (which is not possible in a
UPDATE query for SQLite) and then update them in a seperate query.
- Add unit test.
- Resolves https://codeberg.org/forgejo/forgejo/issues/1856
(cherry picked from commit 8098ca9d2e)
Conflicts:
models/issues/comment.go
https://codeberg.org/forgejo/forgejo/pulls/2075
(cherry picked from commit ca65deba1c)
(cherry picked from commit 0e1e09e77d)
(cherry picked from commit 19013ba5ea)
(cherry picked from commit 23c887f97e)
(cherry picked from commit b3321d1a84)
