tests(quinn): Ignore stress tests by default #5162

Job	Run time
test on illumos	5m 34s
test on netbsd	5m 28s
lint	1m 30s
audit	21s
msrv	1m 2s
test (ubuntu-latest, stable)	1m 34s
test-aws-lc-rs	1m 47s
test (ubuntu-latest, beta)	1m 19s
test on freebsd	4m 26s
test on solaris	6h 0m 1s
test (macos-latest, stable)	1m 13s
test (windows-latest, stable)	4m 13s
test wasm32-unknown-unknown	51s
features (ubuntu-latest)	1h 27m 48s
features (macos-latest)	31m 9s
test-android (x86_64-linux-android, x86_64, 26)	3m 16s
features (windows-latest)	49m 22s
test-android (i686-linux-android, x86, 26)	3m 1s
	9h 23m 55s

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