testsuite: fixes for Lassen #7802

Job	Run time
validate commits	14s
spelling	6s
Generate build matrix	8s
python linting	40s
bookworm	24m 34s
bookworm - 32 bit	23m 33s
bookworm - gcc-12,content-s3,distcheck	14m 49s
bookworm - py3.11,clang-15	28m 10s
coverage	35m 4s
jammy - test-install	16m 4s
bookworm - test-install	21m 15s
focal - py3.8	12m 37s
el8	15m 5s
el8 - ascii	25m 46s
el8 - system,coverage	6m 12s
fedora34 - gcc-11.2,py3.9	13m 31s
fedora38 - gcc-13.1,py3.11	12m 8s
inception	25m 9s
flux-sched check	5m 48s
flux-pmix check	13m 5s
flux-pam check	3m 52s
flux-accounting check	4m 5s
Generate docker manifest	1s
	5h 1m 56s

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