Add retry logic to stabilize flaky UI tests

[kllysng]

Added optional retry logic for the test failures related to the client process start failures.

Addresses #3179

[kllysng]

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[github-actions]

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[jennyf19]

thank you!

[jmprieur]

Great idea to see the output.
They might be mixed-up between processes, though (not sure). Maybe have a prefix ("webApp", "webApi")

Also, I think that console.Writeline is not going to work? but it requires injecting the ITestOutputHelper?

[JoshLozensky]

A couple of nits but otherwise looks good

[github-actions]

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