testsuite: fixes for Lassen #7799

Job	Run time
validate commits	14s
spelling	8s
Generate build matrix	17s
python linting	46s
bookworm	23m 28s
bookworm - 32 bit	13m 28s
bookworm - gcc-12,content-s3,distcheck	14m 48s
bookworm - py3.11,clang-15	28m 28s
coverage	35m 35s
jammy - test-install	9m 42s
bookworm - test-install	9m 53s
focal - py3.8	28m 45s
el8	27m 24s
el8 - ascii	32m 55s
el8 - system,coverage	8m 49s
fedora34 - gcc-11.2,py3.9	13m 22s
fedora38 - gcc-13.1,py3.11	12m 4s
inception	16m 12s
flux-pmix check	13m 0s
flux-pam check	4m 32s
flux-accounting check	6m 31s
flux-sched check	8m 4s
Generate docker manifest	1s
	5h 8m 26s

Provide feedback