Add skip for FPM resource heavy tests

Add skip for FPM process idle flaky test

Increase read timeout in FPM process idle test

Increase script sleep in FPM process idle test

Disable failing FPM test

Test fails intermittently, e.g.:

https://dev.azure.com/phpazuredevops/PHP/_build/results?buildId=20597&view=ms.vss-test-web.build-test-results-tab&runId=475

Disable failing FPM test

Test fails intermittently, e.g.:

https://dev.azure.com/phpazuredevops/PHP/_build/results?buildId=20597&view=ms.vss-test-web.build-test-results-tab&runId=475324&resultId=115501&paneView=debug

Possibly this is because the two requests end up being processed
in sequence and no second process is spawned.

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Add the actual test for FPM prod idle timeout test with 6s sleep