kvs: remove internal treq api #10214

Job	Run time
spelling	7s
Generate build matrix	10s
validate commits	14s
python linting	33s
bookworm - test-install	10m 11s
bookworm - 32 bit	10m 11s
noble - test-install	10m 8s
el9 - test-install	10m 10s
alpine - test-install	10m 11s
fedora40 - test-install	10m 9s
jammy - test-install	10m 10s
focal - py3.8	10m 9s
bookworm - gcc-12,content-s3,distcheck	10m 11s
fedora40 - clang-18	10m 9s
coverage	10m 10s
el8 - ascii	10m 11s
el8 - test-install	10m 10s
el8 - system,coverage	7m 18s
inception	10m 9s
flux-pam check	4m 33s
flux-accounting check	4m 55s
flux-sched check	5m 5s
macos build only	3m 21s
flux-pmix check	5m 34s
Generate docker manifest	1s
	2h 54m 10s

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