The recent change on xorm for `Sync` is it will not warn when database
have columns which is not listed on struct. So we just need this warn
logs when `Sync` the whole database but not in the migrations Sync.
This PR will remove almost unnecessary warning logs on migrations.
Now below logs in CI will disappear.
```log
2023/06/23 17:51:32 models/db/engine.go:191:InitEngineWithMigration() [W] Table gtestschema.project has column creator_id but struct has not related field
2023/06/23 17:51:32 models/db/engine.go:191:InitEngineWithMigration() [W] Table gtestschema.project has column is_closed but struct has not related field
2023/06/23 17:51:32 models/db/engine.go:191:InitEngineWithMigration() [W] Table gtestschema.project has column board_type but struct has not related field
2023/06/23 17:51:32 models/db/engine.go:191:InitEngineWithMigration() [W] Table gtestschema.project has column type but struct has not related field
2023/06/23 17:51:32 models/db/engine.go:191:InitEngineWithMigration() [W] Table gtestschema.project has column closed_date_unix but struct has not related field
2023/06/23 17:51:32 models/db/engine.go:191:InitEngineWithMigration() [W] Table gtestschema.project has column created_unix but struct has not related field
2023/06/23 17:51:32 models/db/engine.go:191:InitEngineWithMigration() [W] Table gtestschema.project has column updated_unix but struct has not related field
2023/06/23 17:51:32 models/db/engine.go:191:InitEngineWithMigration() [W] Table gtestschema.project has column card_type but struct has not related field
```
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