TST: remove 2D tests irrelevant for pyarrow
Gets rid of 3367 irrelevant xfails cc @mroeschke 
Could we skip them instead or leave a comment in this file that they are intentionally not implemented? Just don't want someone to try to re-address these tests in the future. What if we better-documented the fact that these are only relevant for 2D-supporting EAs (and NDArrayBacked2DTests specifically for NDArrayBackedExtensionArray)? > NDArrayBacked2DTests

Sure, that would work too. added an extra comment Thanks @jbrockmendel 

Backporting as relevant to the new ArrowExtensionArray in 1.5