testsuite: add issue reproducer for #5518 #2381

Job	Run time
validate commits	0s
Generate build matrix	7s
python linting	51s
spelling	9s
bookworm	13m 46s
bookworm - 32 bit	25m 25s
bookworm - gcc-12,content-s3,distcheck	36m 15s
bookworm - py3.11,clang-15	29m 56s
coverage	45m 31s
jammy - test-install	11m 0s
bookworm - test-install	19m 57s
focal - py3.8	14m 20s
el8	35m 37s
el8 - ascii	15m 30s
el8 - system,coverage	6m 11s
fedora34 - gcc-11.2,py3.9	14m 30s
fedora38 - gcc-13.1,py3.11	6m 25s
inception	32m 6s
flux-pmix check	16m 49s
flux-sched check	5m 49s
flux-accounting check	4m 4s
flux-pam check	5m 43s
Generate docker manifest	0s
	5h 40m 1s

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