test: add WPT user-timing tests (#32123)

As discussed in
https://github.com/servo/servo/pull/32120#issuecomment-2068017033, this
adds the WPT `user-timing` tests to the default list of WPT tests, and
also commits the current status of the `user-timing` tests.


---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] There are tests for these changes

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tests/wpt/meta/user-timing/idlharness.any.js.ini

@@ -0,0 +1,39 @@
+[idlharness.any.serviceworker.html]
+  expected: ERROR
+
+[idlharness.any.worker.html]
+  [PerformanceMark interface object length]
+    expected: FAIL
+
+  [PerformanceMark interface: attribute detail]
+    expected: FAIL
+
+  [PerformanceMark interface: mark must inherit property "detail" with the proper type]
+    expected: FAIL
+
+  [PerformanceMeasure interface: attribute detail]
+    expected: FAIL
+
+  [PerformanceMeasure interface: measure must inherit property "detail" with the proper type]
+    expected: FAIL
+
+
+[idlharness.any.html]
+  [PerformanceMark interface object length]
+    expected: FAIL
+
+  [PerformanceMark interface: attribute detail]
+    expected: FAIL
+
+  [PerformanceMark interface: mark must inherit property "detail" with the proper type]
+    expected: FAIL
+
+  [PerformanceMeasure interface: attribute detail]
+    expected: FAIL
+
+  [PerformanceMeasure interface: measure must inherit property "detail" with the proper type]
+    expected: FAIL
+
+
+[idlharness.any.sharedworker.html]
+  expected: ERROR