Penultimate round of db.DefaultContext refactor (#27414)

Part of #27065

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Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

models/auth/source_test.go

@@ -42,7 +42,7 @@ func TestDumpAuthSource(t *testing.T) {
 
 	auth_model.RegisterTypeConfig(auth_model.OAuth2, new(TestSource))
 
-	auth_model.CreateSource(&auth_model.Source{
+	auth_model.CreateSource(db.DefaultContext, &auth_model.Source{
 		Type:     auth_model.OAuth2,
 		Name:     "TestSource",
 		IsActive: false,