Use project version of ajv-cli in npm:validate task #1800

Job	Run time
run-determination	4s
check-errors (docsgen)	52s
check-errors (.)	44s
check-outdated (docsgen)	15s
check-errors (ruledocsgen)	47s
check-outdated (.)	15s
check-style (.)	29s
check-style (ruledocsgen)	27s
check-style (docsgen)	23s
check-outdated (ruledocsgen)	20s
check-formatting (.)	19s
check-formatting (ruledocsgen)	21s
check-formatting (docsgen)	14s
check-config (.)	20s
check-config (ruledocsgen)	29s
check-config (docsgen)	28s
	6m 47s

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