Disallow pending interrupts to be checked during FiberScheduler#unblock #2144

Job	Run time
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	11m 55s
cargo test	46s
make (check, --enable-yjit, --yjit)	6m 8s
YJIT macOS result	2s
	18m 51s

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