Use db.Find instead of writing methods for every object (#28084)

For those simple objects, it's unnecessary to write the find and count
methods again and again.

cmd/admin_auth.go

@@ -9,6 +9,7 @@ import (
 	"text/tabwriter"
 
 	auth_model "code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
 	auth_service "code.gitea.io/gitea/services/auth"
 
 	"github.com/urfave/cli/v2"
@@ -62,7 +63,7 @@ func runListAuth(c *cli.Context) error {
 		return err
 	}
 
-	authSources, err := auth_model.FindSources(ctx, auth_model.FindSourcesOptions{})
+	authSources, err := db.Find[auth_model.Source](ctx, auth_model.FindSourcesOptions{})
 	if err != nil {
 		return err
 	}