Add sensible defaults to additional HEADER prompts #5368

Job	Run time
http3_test	57s
android_ndk_lts (aarch64-linux-android)	1m 12s
nginx (1.16.1)	48s
android_ndk_lts (armv7-linux-androideabi)	1m 4s
docker	3m 17s
quiche	4m 27s
android_ndk_lts (x86_64-linux-android)	1m 7s
android_ndk_lts (i686-linux-android)	1m 12s
quiche (boringssl-boring-crate)	4m 29s
quiche_ios (x86_64-apple-ios)	1m 14s
quiche (openssl)	7m 9s
quiche_ios (aarch64-apple-ios)	1m 19s
quiche_macos (macos-13)	5m 15s
quiche_macos (macos-latest)	1m 49s
quiche_multiarch (aarch64-unknown-linux-gnu)	3m 6s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	3m 29s
quiche_windows (x86_64-pc-windows-msvc)	4m 33s
quiche_multiarch (i686-unknown-linux-gnu)	1m 53s
quiche_windows (i686-pc-windows-msvc)	4m 33s
quiche_windows (x86_64-pc-windows-gnu)	5m 21s
quiche_windows (i686-pc-windows-gnu)	6m 16s
	1h 4m 30s

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