Media: Remove required attribute from media uploader file input field. #23378

Job	Run time
QUnit Tests / Run QUnit tests	2m 27s
Slack Notifications / Prepare notifications	5s
Slack Notifications / Success notifications	5s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Cancelled notifications	-1s
Slack Notifications / Failure notifications	-1s
Failed workflow tasks	0s
	2m 35s

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