avoid scheduling jobs on compute nodes that are not cleaned up #10253

Job	Run time
validate commits	10s
spelling	5s
Generate build matrix	11s
python linting	34s
bookworm - test-install	12m 19s
bookworm - 32 bit	13m 2s
noble - test-install	12m 47s
el9 - test-install	12m 37s
alpine - test-install	12m 37s
fedora40 - test-install	12m 0s
jammy - test-install	11m 46s
focal - py3.8	16m 52s
bookworm - gcc-12,content-s3,distcheck	19m 58s
fedora40 - clang-18	17m 53s
coverage	24m 33s
el8 - ascii	19m 26s
el8 - test-install	14m 19s
el8 - system,coverage	7m 8s
inception	21m 25s
flux-pmix check	12m 59s
flux-accounting check	4m 40s
flux-pam check	4m 13s
macos build only	2m 54s
flux-sched check	6m 58s
Generate docker manifest	1s
	4h 21m 27s

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