Add infrastructure for checking Poetry configuration files #1811

Job	Run time
run-determination	3s
check-outdated (.)	21s
check-outdated (docsgen)	20s
check-outdated (ruledocsgen)	17s
check-errors (.)	44s
check-style (.)	28s
check-errors (docsgen)	49s
check-formatting (docsgen)	17s
check-errors (ruledocsgen)	48s
check-style (docsgen)	23s
check-style (ruledocsgen)	29s
check-formatting (.)	23s
check-formatting (ruledocsgen)	21s
check-config (.)	31s
check-config (docsgen)	25s
check-config (ruledocsgen)	32s
	7m 11s

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