[ews] Expected additionalArguments frequently missing from iOS layout…

… test queues

https://bugs.webkit.org/show_bug.cgi?id=255742
rdar://108332842

Reviewed by Aakash Jain.

This is a speculative fix, I wasn't able to reproduce this issue when validating my use of
additionalArguments for iOS on the EWS dev instance before I deployed it to production.

* Tools/CISupport/ews-build/steps.py:
(Trigger.propertiesToPassToTriggers): Add additionalArguments to the list of properties
to pass to triggered builds.

Canonical link: https://commits.webkit.org/263195@main

Tools/CISupport/ews-build/steps.py

@@ -2297,6 +2297,7 @@ def propertiesToPassToTriggers(self, patch=True, pull_request=False):
             'platform',
             'fullPlatform',
             'architecture',
+            'additionalArguments'
         ]
         if patch:
             property_names += ['patch_id', 'bug_id', 'owner']