[test] Disable TSAN thread leak detection for more tests that call exit.

Cf. cee7000c1a.

TEST=tsan
Bug: https://github.com/dart-lang/sdk/issues/62405
Change-Id: I03d6bd34e57c249f0e62ae87179614b9871e0436
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/474483
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

runtime/tests/vm/dart/isolates/many_isolates_blocked_at_process_run_sync_test.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// Environment=TSAN_OPTIONS=report_thread_leaks=0
+
 import "dart:isolate";
 import "dart:io";
 

runtime/tests/vm/dart/isolates/many_isolates_blocked_at_sleep_test.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// Environment=TSAN_OPTIONS=report_thread_leaks=0
+
 import "dart:isolate";
 import "dart:io";
 

tests/standalone/io/exit_works_with_blocked_isolate_test.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// Environment=TSAN_OPTIONS=report_thread_leaks=0
+
 import "dart:io";
 import "dart:isolate";
 

tests/standalone/io/http_server_close_response_after_error_client.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// Environment=TSAN_OPTIONS=report_thread_leaks=0
+
 import 'dart:async';
 import 'dart:io';
 

tests/standalone/io/process_sync_test.dart

@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // OtherResources=process_sync_script.dart
+// Environment=TSAN_OPTIONS=report_thread_leaks=0
 
 import "dart:io";
 import "package:expect/expect.dart";

tests/standalone/io/regress_7191_test.dart

@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // OtherResources=regress_7191_script.dart
+// Environment=TSAN_OPTIONS=report_thread_leaks=0
 
 // Regression test for http://dartbug.com/7191.
 

tests/standalone/io/signal_test_script.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// Environment=TSAN_OPTIONS=report_thread_leaks=0
+
 import "dart:io";
 import "dart:async";