Allow untyped form arrays for step input #7571

Job	Run time
Preparing	5s
Pre-Planet build	7s
Deploy single language build	3m 25s
Planet build (arm64)	26s
Planet build (amd64)	32s
Planet build (arm)	30s
Manifest build	29s
Preparing	5s
Deploy single language build	3m 16s
Pre-Planet build	7s
Planet build (arm)	27s
Planet build (arm64)	27s
Planet build (amd64)	32s
Manifest build	39s
Preparing	5s
Pre-Planet build	7s
Deploy single language build	3m 19s
Planet build (arm64)	28s
Planet build (arm)	27s
Planet build (amd64)	32s
Manifest build	32s
	16m 37s

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