Auto merge of #23323 - nehalem501:master, r=jdm

Implement connectStart in PerformanceResourceTiming

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- Added connectStart where needed (```ResourceFetchTiming```, ```ResourceAttribute```) in ```components/net_traits/lib.rs ```
- Before calling ```client.request``` in ```obtain_response```, we now add the ```connectStart``` attribute (```components/net/http_loader.rs```)
- Updated tests to reflect those changes

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- [x] `./mach test-tidy` does not report any errors
- [X] These changes fix #21261 (at least partially)

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- [X] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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components/script/dom/webidls/PerformanceResourceTiming.webidl

@@ -17,7 +17,7 @@ interface PerformanceResourceTiming : PerformanceEntry {
     readonly attribute DOMHighResTimeStamp fetchStart;
     // readonly attribute DOMHighResTimeStamp domainLookupStart;
     // readonly attribute DOMHighResTimeStamp domainLookupEnd;
-    // readonly attribute DOMHighResTimeStamp connectStart;
+    readonly attribute DOMHighResTimeStamp connectStart;
     readonly attribute DOMHighResTimeStamp connectEnd;
     // readonly attribute DOMHighResTimeStamp secureConnectionStart;
     readonly attribute DOMHighResTimeStamp requestStart;