[analysis_server] Move test/integration to integration_test

This was mostly a rename/move of the folder (and the analysis server updated all references), but I also had to:

- add `integration_test/analysis_options.yaml` to import from `../test` to get the same lint ignores
- update paths of exclusions in `verify_sorted_test.dart`

By moving all of the tests that start the server out-of-process out of test, we can:

1. Use "dart test" to just run the faster tests ("dart test test") and get functionality of the pkg:test runner (for example running tests concurrently and JSON output)
2. Allow VS Code to spawn different debug sessions for the "test" and "integration_test" folder, which means we can use a `preLaunchTask` to trigger compilation of the analysis server from source whenever running integration tests (avoiding having to compile manually, or run from source in a way that compiles a new server for each test suite)

Change-Id: I37cc03dc32d08c5b51a2eab79f6338bb079b32ac
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/434801
Commit-Queue: Brian Wilkerson <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>

Author: DanTup

pkg/analysis_server/CONTRIBUTING.md

@@ -9,8 +9,8 @@ import 'dart:math' show max, sqrt;
 import 'package:logging/logging.dart';
 import 'package:path/path.dart';
 
-import '../../test/integration/support/integration_test_methods.dart';
-import '../../test/integration/support/integration_tests.dart';
+import '../../integration_test/support/integration_test_methods.dart';
+import '../../integration_test/support/integration_tests.dart';
 import 'operation.dart';
 
 /// [Driver] launches and manages an instance of analysis server,

pkg/analysis_server/benchmark/integration/driver.dart

@@ -12,8 +12,8 @@ import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:test/test.dart';
 
-import '../../test/integration/lsp_server/integration_tests.dart';
-import '../../test/integration/support/integration_tests.dart';
+import '../../integration_test/lsp_server/integration_tests.dart';
+import '../../integration_test/support/integration_tests.dart';
 import '../../test/lsp/server_abstract.dart' show ClientCapabilitiesHelperMixin;
 
 /// A server protocol-agnostic interface to the memory test, allowing the same