tests(quinn): Ignore stress tests by default #5163

Job	Run time
test on illumos	7m 5s
test on netbsd	5m 0s
features (ubuntu-latest)	1h 22m 26s
audit	22s
lint	1m 11s
features (macos-latest)	26m 5s
msrv	1m 4s
features (windows-latest)	50m 39s
test (ubuntu-latest, stable)	1m 28s
test-android (x86_64-linux-android, x86_64, 26)	3m 15s
test-aws-lc-rs	1m 55s
test (ubuntu-latest, beta)	1m 12s
test on freebsd	4m 10s
test-android (i686-linux-android, x86, 26)	3m 4s
test (macos-latest, stable)	1m 21s
test (windows-latest, stable)	4m 28s
test on solaris	6h 0m 0s
test wasm32-unknown-unknown	1m 0s
	9h 15m 45s

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