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/secrets/secrets.go

@@ -76,7 +76,7 @@ func DeleteSecretByName(ctx context.Context, ownerID, repoID int64, name string)
 }
 
 func deleteSecret(ctx context.Context, s *secret_model.Secret) error {
-	if _, err := db.DeleteByID(ctx, s.ID, s); err != nil {
+	if _, err := db.DeleteByID[secret_model.Secret](ctx, s.ID); err != nil {
 		return err
 	}
 	return nil