Remove unused helpers from datalad.interface.utils

[mih]

See #6005

Changelog

🪓 Deprecations and removals

• Remove unused and untested datalad.interface.utils helpers cls2cmdlinename and path_is_under

[codeclimate]

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[codecov]

Codecov Report

Merging #6392 (e3e77de) into master (c2183b3) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6392      +/-   ##
==========================================
+ Coverage   89.94%   89.97%   +0.03%     
==========================================
  Files         344      344              
  Lines       43286    43273      -13     
==========================================
+ Hits        38934    38937       +3     
+ Misses       4352     4336      -16     

Impacted Files	Coverage Δ
datalad/interface/utils.py	96.22% <ø> (+5.38%)	⬆️
datalad/cli/common_args.py	100.00% <0.00%> (ø)
datalad/interface/common_opts.py	100.00% <0.00%> (ø)
datalad/interface/base.py	90.25% <0.00%> (+0.25%)	⬆️

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