Remove or simplify various utility functions

[vyasr]

This PR excises some of the functions in cudf/utils/utils.py and moves others as close to their point of use as possible. Most of the moved functions were essentially single-use functions, while the removed functions were either unnecessary or had obvious preexisting replacements.

[codecov]

Codecov Report

Merging #10705 (32507a6) into branch-22.06 (65b1cbd) will increase coverage by 0.03%.
The diff coverage is 96.77%.

@@               Coverage Diff                @@
##           branch-22.06   #10705      +/-   ##
================================================
+ Coverage         86.35%   86.38%   +0.03%     
================================================
  Files               142      142              
  Lines             22335    22296      -39     
================================================
- Hits              19287    19261      -26     
+ Misses             3048     3035      -13     

Impacted Files	Coverage Δ
python/cudf/cudf/core/frame.py	93.41% <ø> (ø)
python/cudf/cudf/utils/utils.py	90.35% <ø> (+0.06%)	⬆️
python/cudf/cudf/core/column/numerical.py	95.88% <50.00%> (ø)
python/cudf/cudf/core/column/categorical.py	89.97% <100.00%> (+0.20%)	⬆️
python/cudf/cudf/core/column/column.py	89.43% <100.00%> (-0.02%)	⬇️
python/cudf/cudf/core/column/string.py	89.21% <100.00%> (+0.10%)	⬆️
python/cudf/cudf/core/dataframe.py	93.75% <100.00%> (+<0.01%)	⬆️
python/cudf/cudf/core/multiindex.py	92.28% <100.00%> (+0.13%)	⬆️
python/cudf/cudf/core/series.py	95.15% <100.00%> (ø)
python/cudf/cudf/testing/_utils.py	93.98% <100.00%> (+0.13%)	⬆️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 65b1cbd...32507a6. Read the comment docs.

[vyasr]

@gpucibot merge