Post: Remove unused variable `$hidden_inputs` #27653

Job	Run time
Core running from src / Windows	3m 47s
Core running from src / MacOS	2m 33s
Core running from build / Linux	2m 29s
Core running from src / Linux	2m 22s
Core running from build / Windows	3m 40s
Core running from build / MacOS	3m 9s
Slack Notifications	-1s
Failed workflow tasks	0s
	17m 59s

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