Use longer timeouts in some Kestrel functional tests

[halter73]

#32162 caused the tests modified by this PR to fail pretty consistently on local debug builds for me and @Tratcher at least.

Fixes #33237

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[BrennanConroy]

Honestly I'd just remove the 5 second change, 30 seconds isn't really that long, and if you're doing active development that might hang things, just change the default locally.

[JamesNK]

30 seconds is annoying when you’re making dev changes and you need to wait half a minute for tests to report timeouts because of regressions.

I don’t want to change a value every time I start doing dev work.

If a longer timeout is required in a select few places then just change those places.

[halter73]

/azp run

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