[PROF-7966] Add passenger testing to rack integration app #2998
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What does this PR do?:
This PR adds one more webserver to the rack integration testing app: Phusion Passenger.
Motivation:
In #2976 a customer reported an issue with profiling apps running on passenger. I'm adding passenger to our test suite to avoid any future regressions.
Additional Notes:
I've actually tested that the customer issue does show up on our integration app if I revert the changes from #2978.
How to test the change?:
Validate that the rack CI app is running with passenger as well.