Move SdkExtUriResolver from analysis_server to analyzer so it can be used in analyzer_cli

pkg/analysis_server/test/src/test_all.dart

Index: pkg/analysis_server/test/src/test_all.dart
diff --git a/pkg/analysis_server/test/src/test_all.dart b/pkg/analysis_server/test/src/test_all.dart
index a24061ef40c12106dbe744e58ef5ea875afc4084..d5f5729cdc0b544389bd6c7f85a5062c1645c373 100644
--- a/pkg/analysis_server/test/src/test_all.dart
+++ b/pkg/analysis_server/test/src/test_all.dart
@@ -6,7 +6,6 @@ library test.src;
 
 import 'package:unittest/unittest.dart';
 
-import 'sdk_ext_test.dart' as sdk_ext_test;
 import 'utilities/test_all.dart' as utilities_all;
 
 /**
@@ -15,7 +14,6 @@ import 'utilities/test_all.dart' as utilities_all;
 main() {
   groupSep = ' | ';
   group('analysis_server', () {
-    sdk_ext_test.main();
     utilities_all.main();
   });
 }