testsuite: python: ensure OutputFormat precision handling #3239

Job	Run time
python linting	28s
spelling	8s
Generate build matrix	7s
validate commits	0s
bookworm - test-install	12m 29s
bookworm - 32 bit	12m 51s
noble - test-install	12m 25s
el9 - test-install	11m 56s
alpine - test-install	12m 7s
fedora40 - test-install	11m 46s
jammy - test-install	11m 47s
focal - py3.8	17m 23s
bookworm - gcc-12,content-s3,distcheck	19m 57s
fedora40 - clang-18	16m 28s
coverage	24m 4s
el8 - ascii	19m 39s
el8 - test-install	13m 9s
el8 - system,coverage	7m 35s
inception	21m 37s
flux-accounting check	4m 35s
flux-sched check	6m 54s
macos build only	3m 4s
flux-pam check	4m 27s
flux-pmix check	13m 10s
Generate docker manifest	1s
	4h 18m 7s

Provide feedback