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>

models/webhook/webhook.go

@@ -471,7 +471,7 @@ func DeleteWebhookByID(ctx context.Context, id int64) (err error) {
 	}
 	defer committer.Close()
 
-	if count, err := db.DeleteByID(ctx, id, new(Webhook)); err != nil {
+	if count, err := db.DeleteByID[Webhook](ctx, id); err != nil {
 		return err
 	} else if count == 0 {
 		return ErrWebhookNotExist{ID: id}