Use add_color_level() conditionally

[cidlik]

Description
According to [1] add_color_level() is a method of ColoredLevelFormatter
only. The exception AttributeError is raised for other formatters.

[1] https://github.com/pytest-dev/pytest/blob/main/src/_pytest/logging.py#L104

Checklist

• Documentation for the feature
• Tests for the feature

• The arguments and description in doc/configuration.rst have been updated

• Add a section on how to use the feature to doc/usage.rst

• Add a section on how to use the feature to doc/development.rst

• PR has been tested

• Man pages have been regenerated

[Emantor]

Thanks for the PR, this is missing a DCO, you can add this with git commit --amend -s and doing a force push to the branch.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.0%. Comparing base (c609d2d) to head (2c6c3b8).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1592   +/-   ##
======================================
  Coverage    56.0%   56.0%           
======================================
  Files         170     170           
  Lines       13307   13308    +1     
======================================
+ Hits         7458    7459    +1     
  Misses       5849    5849           

Flag	Coverage Δ
3.10	56.0% <100.0%> (+<0.1%)	⬆️
3.11	56.0% <100.0%> (+<0.1%)	⬆️
3.12	56.0% <100.0%> (+<0.1%)	⬆️
3.13	56.0% <100.0%> (+<0.1%)	⬆️
3.9	56.0% <100.0%> (+<0.1%)	⬆️

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