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>

tests/integration/repo_tag_test.go

@@ -81,7 +81,7 @@ func TestCreateNewTagProtected(t *testing.T) {
 	assert.NoError(t, err)
 
 	for _, release := range releases {
-		err = repo_model.DeleteReleaseByID(db.DefaultContext, release.ID)
+		_, err = db.DeleteByID[repo_model.Release](db.DefaultContext, release.ID)
 		assert.NoError(t, err)
 	}