Validate with jsonschema #1760

Job	Run time
deploy	35s
test (3.8, lint)	41s
test (3.8, lint_docs)	1m 26s
test (3.8, mypy)	47s
test (3.8, unit-quick)	51s
test (3.8, unit-diagnostic-servebasic-gx-dev)	1m 58s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2109)	54s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2205)	1m 30s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-dev)	1m 7s
test (3.8, unit-nonredundant-noclientbuild-noshed-nogx)	54s
test (3.8, unit-diagnostic-serveclientcmd)	2m 23s
test (3.11, lint)	38s
test (3.11, mypy)	41s
test (3.11, unit-quick)	2m 43s
	17m 8s

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