Auto merge of #25697 - pshaughn:supportedentrytypes, r=jdm

PerformanceObserver.supportedEntryTypes

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It felt odd to cache these directly in GlobalScope, but they need to be [SameObject] and the global scope is where the spec implies they go.

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- [X] `./mach build -d` does not report any errors
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- [X] These changes fix #25587

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- [X] There are tests for these changes

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components/script/dom/webidls/PerformanceObserver.webidl

@@ -21,5 +21,6 @@ interface PerformanceObserver {
   void observe(optional PerformanceObserverInit options = {});
   void disconnect();
   PerformanceEntryList takeRecords();
-  // [SameObject] static readonly attribute FrozenArray<DOMString> supportedEntryTypes;
+  // codegen doesn't like SameObject+static and doesn't know FrozenArray
+  /*[SameObject]*/ static readonly attribute /*FrozenArray<DOMString>*/ any supportedEntryTypes;
 };