Use cudf::detail::make_counting_transform_iterator

[codereport]

Came across some "raw" uses of thrust::make_transform_iterator + thrust::make_counting_iterator where now cudf::detail::make_counting_transform_iterator can be used (because of #6546).

[codecov]

Codecov Report

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@@              Coverage Diff               @@
##             branch-0.19    #7338   +/-   ##
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  Coverage               ?   82.22%           
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  Files                  ?      100           
  Lines                  ?    16969           
  Branches               ?        0           
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  Hits                   ?    13953           
  Misses                 ?     3016           
  Partials               ?        0           

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[codereport]

rerun tests

[harrism]

Great, except the cases where you replace transform(constant) with transform(counting).

[harrism]

@gpucibot merge