[vm/concurrency] Remove file_write_as_test from iso-stress test suite.

The test seems to be hanging, remove it to green the bot.

BUG=https://github.com/dart-lang/sdk/issues/46694
TEST=iso-stress test bot

Change-Id: I4b1f27354208f24395d41bfca0403cbabdb4ce35
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/207922
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>
diff --git a/runtime/tests/concurrency/stress_test_list.json b/runtime/tests/concurrency/stress_test_list.json
index 8512343..7981ebb 100644
--- a/runtime/tests/concurrency/stress_test_list.json
+++ b/runtime/tests/concurrency/stress_test_list.json
@@ -3272,7 +3272,6 @@
     "../../../tests/standalone/io/file_system_uri_test.dart",
     "../../../tests/standalone/io/file_typed_data_test.dart",
     "../../../tests/standalone/io/file_windows_test.dart",
-    "../../../tests/standalone/io/file_write_as_test.dart",
     "../../../tests/standalone/io/file_write_only_test.dart",
     "../../../tests/standalone/io/gzip_format_exception_test.dart",
     "../../../tests/standalone/io/http_100_continue_test.dart",
@@ -6604,7 +6603,6 @@
     "../../../tests/standalone_2/io/file_system_uri_test.dart",
     "../../../tests/standalone_2/io/file_typed_data_test.dart",
     "../../../tests/standalone_2/io/file_windows_test.dart",
-    "../../../tests/standalone_2/io/file_write_as_test.dart",
     "../../../tests/standalone_2/io/file_write_only_test.dart",
     "../../../tests/standalone_2/io/gzip_format_exception_test.dart",
     "../../../tests/standalone_2/io/http_100_continue_test.dart",