testsuite: add tests for per-node/task output redirection #3267

Job	Run time
validate commits	0s
Generate build matrix	9s
spelling	5s
python linting	33s
bookworm - test-install	6m 55s
bookworm - 32 bit	6m 55s
noble - test-install	6m 54s
el9 - test-install	6m 54s
alpine - test-install	6m 55s
fedora40 - test-install	6m 54s
jammy - test-install	6m 54s
focal - py3.8	6m 53s
bookworm - gcc-12,content-s3,distcheck	6m 53s
fedora40 - clang-18	6m 53s
coverage	6m 53s
el8 - ascii	6m 55s
el8 - test-install	6m 54s
el8 - system,coverage	6m 54s
inception	6m 53s
flux-accounting check	4m 47s
flux-pmix check	6m 30s
macos build only	2m 55s
flux-pam check	4m 19s
flux-sched check	2m 9s
Generate docker manifest	1s
	2h 4m 57s

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