Remove floating point types from cudf::sort fast-path

[davidwendt]

PR #7215 removed single floating point columns from radix sort fast-path but missed disabling the fast-path sort for floating-point in cudf::sort().

This PR fixes cudf::sort and adds a new test to the existing RowOperatorTestForNAN.NANSortingNonNull gtest.

[codecov]

Codecov Report

Merging #7250 (721bae6) into branch-0.18 (8860baf) will increase coverage by 0.12%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.18    #7250      +/-   ##
===============================================
+ Coverage        82.09%   82.21%   +0.12%     
===============================================
  Files               97       99       +2     
  Lines            16474    16844     +370     
===============================================
+ Hits             13524    13849     +325     
- Misses            2950     2995      +45     

Impacted Files	Coverage Δ
python/cudf/cudf/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/parquet.py	0.00% <ø> (ø)
python/cudf/cudf/_lib/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/_typing.py	92.30% <ø> (ø)
python/cudf/cudf/core/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/core/abc.py	91.48% <ø> (+4.25%)	⬆️
python/cudf/cudf/core/buffer.py	80.00% <ø> (+0.95%)	⬆️
python/cudf/cudf/core/column/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/core/column/categorical.py	92.73% <ø> (-0.62%)	⬇️
python/cudf/cudf/core/column/column.py	87.75% <ø> (-0.39%)	⬇️
... and 71 more

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[davidwendt]

rerun tests

[davidwendt]

@gpucibot merge