Update metadata for infrastructure tests (#37540)

* Update metadata for infrastructure tests

One unexpected OK caused "infrastructure/ tests: macOS" task to fail.
Update metadata to suppress such failures.
diff --git a/infrastructure/metadata/infrastructure/server/context.any.js.ini b/infrastructure/metadata/infrastructure/server/context.any.js.ini
index 1601dfe..72009c6 100644
--- a/infrastructure/metadata/infrastructure/server/context.any.js.ini
+++ b/infrastructure/metadata/infrastructure/server/context.any.js.ini
@@ -1,6 +1,6 @@
 [context.any.worker-module.html]
   expected:
-    if product == "firefox": TIMEOUT # https://bugzilla.mozilla.org/show_bug.cgi?id=1247687
+    if product == "firefox": [TIMEOUT, OK] # https://bugzilla.mozilla.org/show_bug.cgi?id=1247687
 
 [context.any.sharedworker-module.html]
   expected: