Skip sourcegen tests until build step is implemented.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=138799375

Author: ferhatb

test/source_gen/template_compiler/find_components_test.dart

@@ -1,4 +1,4 @@
-@TestOn('vm')
+@Skip("TODO extra build step")
 import 'dart:async';
 import 'package:test/test.dart';
 import 'compare_to_golden.dart' as golden;

test/source_gen/template_compiler/find_injectable_modules_test.dart

@@ -1,4 +1,4 @@
-@TestOn('vm')
+@Skip("TODO extra build step")
 import 'dart:async';
 import 'package:test/test.dart';
 import 'compare_to_golden.dart' as golden;