set FLUX_PMI_LIBRARY_PATH only in the job environment when simple pmi is active #7765

Job	Run time
validate commits	13s
validate commits	13s
Generate build matrix	11s
Generate build matrix	11s
python linting	36s
python linting	36s
spelling	7s
spelling	7s
bookworm	12m 14s
bookworm	12m 14s
bookworm - 32 bit	13m 6s
bookworm - 32 bit	13m 6s
bookworm - gcc-12,content-s3,distcheck	14m 19s
bookworm - gcc-12,content-s3,distcheck	26m 51s
bookworm - py3.11,clang-15	12m 32s
bookworm - py3.11,clang-15	12m 32s
coverage	47m 11s
coverage	47m 11s
jammy - test-install	9m 43s
jammy - test-install	9m 43s
bookworm - test-install	21m 37s
bookworm - test-install	21m 37s
focal - py3.8	24m 26s
focal - py3.8	24m 26s
el8	14m 51s
el8	14m 51s
el8 - ascii	14m 18s
el8 - ascii	14m 18s
el8 - system,coverage	8m 31s
el8 - system,coverage	8m 31s
fedora34 - gcc-11.2,py3.9	30m 13s
fedora34 - gcc-11.2,py3.9	30m 13s
fedora38 - gcc-13.1,py3.11	12m 2s
fedora38 - gcc-13.1,py3.11	12m 2s
inception	15m 39s
inception	31m 57s
flux-accounting check	5m 8s
flux-accounting check	5m 8s
flux-pmix check	13m 45s
flux-pmix check	13m 45s
flux-pam check	4m 10s
flux-pam check	4m 10s
flux-sched check	7m 41s
flux-sched check	7m 41s
Generate docker manifest	0s
Generate docker manifest	0s
	9h 53m 56s

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