Skip all flaky tests in performance-timeline/not-restored-reasons

[syvb]

Skips all of the performance-timeline/not-restored-reasons tests. There are already issues for #32226 and #32213, but it seems #31361 made all of these tests flaky.

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• ./mach test-tidy does not report any errors
• These changes do not require tests because they remove tests

[sagudev]

There is also /fetch/fetch-later/send-on-deactivate.tentative.https.window.html, although maybe we should just revert #31361 an bake it a little more (before all those test were FAIL now, they are flaky TIMEOUT/FAIL, so there isn't anything that would be missing).

[mrobinson]

There is also /fetch/fetch-later/send-on-deactivate.tentative.https.window.html, although maybe we should just revert #31361 an bake it a little more (before all those test were FAIL now, they are flaky TIMEOUT/FAIL, so there isn't anything that would be missing).

It does sound like we should revert #31361 if it made an entire directory of tests flaky.

[mukilan]

The /html/browsers/browsing-the-web/remote-context-helper-tests/navigation-bfcache.window.html test has also failed in the following two runs and seems related to the BFCache
https://github.com/servo/servo/runs/24648485771
https://github.com/servo/servo/runs/24654937105

I'm in favor of reverting #31361