Rename scripts/generators to .cjs for ESM migration #182

Job	Run time
build-and-test / build (16.X, arm64, humble)	7m 51s
build-and-test / build (16.X, arm64, jazzy)	7m 43s
build-and-test / build (16.X, arm64, kilted)	8m 15s
	23m 49s

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