resource: only read resource.scheduling config on rank 0 #3207

Job	Run time
Generate build matrix	9s
python linting	27s
validate commits	0s
spelling	5s
bookworm - test-install	11m 56s
bookworm - 32 bit	13m 3s
noble - test-install	12m 33s
el9 - test-install	3m 28s
alpine - test-install	12m 9s
fedora40 - test-install	11m 44s
jammy - test-install	11m 27s
focal - py3.8	16m 49s
bookworm - gcc-12,content-s3,distcheck	20m 22s
fedora40 - clang-18	16m 41s
coverage	24m 45s
el8 - ascii	19m 35s
el8 - test-install	13m 17s
el8 - system,coverage	7m 53s
inception	21m 37s
flux-accounting check	4m 44s
flux-pmix check	13m 18s
flux-sched check	6m 51s
flux-pam check	4m 13s
Generate docker manifest	0s
	4h 7m 6s

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