Bug 1634389 - disable clear-site-data/executionContexts.sub.html WPT, r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D73725

testing/web-platform/meta/clear-site-data/executionContexts.sub.html.ini

@@ -1,7 +1,2 @@
 [executionContexts.sub.html]
-  expected: TIMEOUT
-  [executionContexts triggers the reload of contexts]
-    expected: TIMEOUT
-
-  [* triggers the reload of contexts]
-    expected: NOTRUN
+  disabled: https://bugzilla.mozilla.org/show_bug.cgi?id=1635189