Disable the Dart format check in the presubmit.

This is temporary while I roll in the new formatter and Alex builds a
new pre-built SDK.

Change-Id: I89a782bec07b14f19dad374a13ca5e8f89a2a841
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/391320
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Devon Carew <devoncarew@google.com>
Commit-Queue: Bob Nystrom <rnystrom@google.com>

PRESUBMIT.py

@@ -532,7 +532,12 @@ def _CheckDevCompilerSync(input_api, output_api):
 def _CommonChecks(input_api, output_api):
     results = []
     results.extend(_CheckValidHostsInDEPS(input_api, output_api))
-    results.extend(_CheckDartFormat(input_api, output_api))
+
+    # TODO(rnystrom): Temporarily disabling dart format checking while
+    # migrating to the new formatting style.
+    # See: https://github.com/dart-lang/sdk/issues/56688
+    # results.extend(_CheckDartFormat(input_api, output_api))
+
     results.extend(_CheckStatusFiles(input_api, output_api))
     results.extend(_CheckLayering(input_api, output_api))
     results.extend(_CheckClangTidy(input_api, output_api))