Refactor deletion (#28610)

Introduce the new generic deletion methods
- `func DeleteByID[T any](ctx context.Context, id int64) (int64, error)`
- `func DeleteByIDs[T any](ctx context.Context, ids ...int64) error`
- `func Delete[T any](ctx context.Context, opts FindOptions) (int64,
error)`

So, we no longer need any specific deletion method and can just use
the generic ones instead.

Replacement of #28450

Closes #28450

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

services/release/release.go

@@ -339,7 +339,7 @@ func DeleteReleaseByID(ctx context.Context, repo *repo_model.Repository, rel *re
 			}, repository.NewPushCommits())
 		notify_service.DeleteRef(ctx, doer, repo, refName)
 
-		if err := repo_model.DeleteReleaseByID(ctx, rel.ID); err != nil {
+		if _, err := db.DeleteByID[repo_model.Release](ctx, rel.ID); err != nil {
 			return fmt.Errorf("DeleteReleaseByID: %w", err)
 		}
 	} else {