Gate PLPMTUD should_panic test on debug_assertions #5202

Job	Run time
test on netbsd	5m 16s
test on illumos	6m 36s
test-aws-lc-rs	1m 40s
test (ubuntu-latest, stable)	1m 48s
test on freebsd	4m 15s
test (ubuntu-latest, beta)	1m 18s
test on solaris	5m 40s
test wasm32-unknown-unknown	48s
test (macos-latest, stable)	1m 9s
test (windows-latest, stable)	4m 45s
audit	24s
features (ubuntu-latest)	1h 29m 14s
features (macos-latest)	24m 10s
lint	1m 25s
features (windows-latest)	51m 51s
msrv	1m 0s
test-android (x86_64-linux-android, x86_64, 26)	3m 15s
test-android (i686-linux-android, x86, 26)	3m 5s
	3h 27m 39s

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