process: optimize asyncHandledRejections by using FixedQueue #1845

Job	Run time
Build slim tarball	1m 33s
x86_64-darwin: with shared libraries	38m 12s
aarch64-linux: with shared libraries	23m 57s
x86_64-linux: with shared libraries	28m 44s
aarch64-darwin: with shared libraries	25m 41s
	1h 58m 7s

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