refactor(utils): make get_backup_file_path to return a path for seman…

[bearomorphism]

…tic correctness

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v4-9-2@939ee43). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
commitizen/commands/commit.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             v4-9-2    #1634   +/-   ##
=========================================
  Coverage          ?   98.32%           
=========================================
  Files             ?       58           
  Lines             ?     2683           
  Branches          ?        0           
=========================================
  Hits              ?     2638           
  Misses            ?       45           
  Partials          ?        0           

Flag	Coverage Δ
unittests	98.32% <94.11%> (?)

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