ARROW-11952: [Rust] Make ArrayData --> GenericListArray fallable instead of panic!
#9691
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Background:
Left over cleanups suggested by from @sunchao on #9425
Broken out from #9508
Rationale:
Don't use panic! directly. However, since the caller of this function still calls
unwrap(), I am not sure how much of an improvement this change really is. However it may set us up for a moresafefuture eventually