feat(commands)!: deprecate '-s' signoff parameter

[AdrianDC]

Description

feat(commands)!: deprecate '-s' signoff parameter

Follow-up to #1206, deprecating -s for major v4.

Checklist

• [x] Add test cases to all the changes you introduce
• [x] Run ./scripts/format and ./scripts/test locally to ensure this change passes linter check and test
• [x] Test the changes on the local machine manually
• [x] Update the documentation for the changes

Expected behavior

Steps to Test This Pull Request

Additional context

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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Additional details and impacted files

@@          Coverage Diff          @@
##             v4    #1221   +/-   ##
=====================================
  Coverage      ?   97.61%           
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  Files         ?       55           
  Lines         ?     2515           
  Branches      ?        0           
=====================================
  Hits          ?     2455           
  Misses        ?       60           
  Partials      ?        0           

Flag	Coverage Δ
unittests	97.61% <100.00%> (?)

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[AdrianDC]

Though implemented per request towards v4, I vote against my own PR,
because some of my teams' developers use it all the time as this is considered "basic" / "normal" usage.

[Lee-W]

Though implemented per request towards v4, I vote against my own PR, because some of my teams' developers use it all the time as this is considered "basic" / "normal" usage.

I'm ok to keep a few exceptions. As long as the underlying logic is not duplicate and the document is suggesting using --

[AdrianDC]

Deprecation of -s canceled for commitizen v4 :+1: