C++ refactoring: 'simplify_uniontype' only in UnionArray

[ioanaif]

No description provided.

[codecov]

Codecov Report

Merging #1130 (6c19830) into main (0b0fb3f) will increase coverage by 2.10%.
The diff coverage is 86.97%.

Impacted Files	Coverage Δ
src/awkward/_v2/forms/bitmaskedform.py	67.94% <ø> (ø)
src/awkward/_v2/forms/bytemaskedform.py	69.01% <ø> (ø)
src/awkward/_v2/forms/indexedform.py	72.00% <ø> (+8.84%)	⬆️
src/awkward/_v2/forms/unmaskedform.py	69.49% <ø> (ø)
src/awkward/_v2/operations/convert/to_arrow.py	80.00% <ø> (+37.14%)	⬆️
src/awkward/_v2/types/numpytype.py	91.80% <ø> (ø)
src/awkward/_v2/forms/indexedoptionform.py	69.56% <50.00%> (-1.21%)	⬇️
src/awkward/_v2/contents/emptyarray.py	75.00% <59.09%> (+2.61%)	⬆️
src/awkward/_v2/contents/bitmaskedarray.py	63.27% <80.00%> (+3.39%)	⬆️
src/awkward/_v2/contents/unmaskedarray.py	62.85% <80.00%> (+0.63%)	⬆️
... and 23 more

[jpivarski]

So far, this removes simplify_uniontype, but it doesn't move it into UnionArray.

[ioanaif]

So far, this removes simplify_uniontype, but it doesn't move it into UnionArray.

It was already in UnionArray, so I just removed it from content.

[jpivarski]

Okay, so is this PR done?

[ioanaif]

Yes. All done with this PR. Will open new ones for the other tickets starting with num

[jpivarski]

Great, thanks!