Backport 7194, BUG: Raise a quieter MaskedArrayFutureWarning
for mask changes
#7218
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#7194.
Fixes #7164
Related: #7020
Related: #5580
Drop the getitem warning. In setitem, check to see if the masked array is shared. If it is shared, we know it will propagate upstream in the future. Also, use a more specific warning type instead of using FutureWarning so that this can be explicitly ignored.