WIP: kvs: support configuration of max transaction count #10273

Job	Run time
Generate build matrix	7s
validate commits	10s
python linting	33s
spelling	8s
bookworm - test-install	12m 35s
bookworm - 32 bit	13m 30s
noble - test-install	13m 5s
el9 - test-install	12m 34s
alpine - test-install	12m 45s
fedora40 - test-install	12m 19s
jammy - test-install	11m 58s
focal - py3.8	17m 31s
bookworm - gcc-12,content-s3,distcheck	20m 1s
fedora40 - clang-18	1h 0m 20s
coverage	24m 37s
el8 - ascii	1h 0m 21s
el8 - test-install	13m 20s
el8 - system,coverage	7m 25s
inception	21m 35s
flux-pmix check	13m 29s
flux-pam check	4m 29s
macos build only	3m 31s
flux-accounting check	4m 48s
flux-sched check	7m 8s
Generate docker manifest	0s
	5h 48m 19s

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