Fix some bug on migrations (#30647)
Fix https://github.com/go-gitea/gitea/pull/23894#discussion_r1573718690
(cherry picked from commit 2ad9ef4984f0b68ef38241fd6b557d8427d851d8)
Conflicts:
models/migrations/v1_16/v210.go
models/migrations/v1_22/v286.go
trivial conflicts because MSSQL is no longer supported
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