Make sure scheduler threads don't ACK the quiescence protocol CNF messages if they have an actor waiting to be run #2826

Job	Run time
Lint bash, docker, markdown, and yaml	1m 42s
Validate GNU Docker image builds	32s
Validate GNU Docker release image builds	39s
Validate musl Docker image builds	23s
Validate musl Docker release image builds	27s
Validate Windows Docker image builds	1m 41s
Validate Windows Docker release image builds	2m 9s
aarch64 Linux glibc	4m 1s
arm64 Apple Darwin	3m 0s
armhf Linux glibc	3m 56s
arm Linux glibc	3m 46s
Verify CHANGELOG is valid	6s
riscv64 Linux glibc	3m 45s
x86-64 Linux glibc	3m 42s
x86-64 Apple Darwin	5m 58s
x86-64 Linux musl	4m 32s
x86-64 Windows MSVC	24m 35s
use ${{ matrix.directives }}	0s
	1h 4m 54s

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