Make sure scheduler threads don't ACK the quiescence protocol CNF messages if they have an actor waiting to be run #2825

Job	Run time
Lint bash, docker, markdown, and yaml	1m 50s
Validate GNU Docker image builds	44s
Validate musl Docker image builds	26s
Validate Windows Docker image builds	2m 9s
aarch64 Linux glibc	3m 49s
armhf Linux glibc	3m 47s
arm Linux glibc	3m 45s
Validate GNU Docker release image builds	29s
riscv64 Linux glibc	3m 47s
Validate musl Docker release image builds	22s
Validate Windows Docker release image builds	1m 57s
Verify CHANGELOG is valid	11s
x86-64 Linux glibc	3m 43s
x86-64 Linux musl	4m 27s
arm64 Apple Darwin	2m 45s
x86-64 Apple Darwin	4m 34s
x86-64 Windows MSVC	5m 17s
use ${{ matrix.directives }}	0s
	44m 2s

Provide feedback