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.

services/auth/source/oauth2/providers.go

@@ -13,6 +13,7 @@ import (
 	"sort"
 
 	"code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/util"
@@ -107,7 +108,7 @@ func CreateProviderFromSource(source *auth.Source) (Provider, error) {
 
 // GetOAuth2Providers returns the list of configured OAuth2 providers
 func GetOAuth2Providers(ctx context.Context, isActive util.OptionalBool) ([]Provider, error) {
-	authSources, err := auth.FindSources(ctx, auth.FindSourcesOptions{
+	authSources, err := db.Find[auth.Source](ctx, auth.FindSourcesOptions{
 		IsActive:  isActive,
 		LoginType: auth.OAuth2,
 	})