fix(material/datepicker): range input controls dirty on init #21223
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Fixes that the date range input controls were marking each other as dirty on initialization. This seems like an easy fix on the surface, but it's somewhat tricky, because while we usually don't want the inputs to respond each other's events, we still want it to happen if an end date before the start date is assigned.
These changes resolve the issue by not having the inputs respond to any events from inside the input, but notify each other when a value is assigned programmatically.
I've also cleaned up some unnecessary code and added more test cases for things that tripped me up while fixing the issue.
Fixes #20213.