Changed all single requests to use through ThreadPoolMan #1961

Job	Run time
macos12	3m 48s
Linux (ubuntu:24.04)	14m 54s
Linux (ubuntu:22.04)	13m 24s
MemoryTest (glibc_debug)	11m 36s
Linux (ubuntu:20.04)	10m 38s
MemoryTest (sanitize_address)	12m 39s
Linux (debian:bookworm)	14m 5s
MemoryTest (sanitize_others)	11m 19s
Linux (debian:bullseye)	10m 50s
MemoryTest (sanitize_thread)	1m 47s
Linux (rockylinux:9)	15m 10s
MemoryTest (valgrind)	25m 29s
Linux (rockylinux:8)	15m 44s
Linux (fedora:40)	14m 1s
Linux (fedora:39)	13m 54s
Linux (opensuse/leap:15)	14m 3s
Linux (alpine:3.20)	19m 39s
Linux (centos:centos7)	36m 58s
	4h 19m 58s

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