ENH: make correlation find bads toggleable

[sappelhoff]

PR Description

Sometimes the correlation method identifies too many false positives.

should be merged after

• FIX: manually marked bad channels must be excluded in find bads #168

Merge Checklist

• the PR has been reviewed and all comments are resolved
• all CI checks pass
• (if applicable): the PR description includes the phrase closes #<issue-number> to automatically close an issue
• (if applicable): the changes are documented in the changelog changelog.rst
• (if applicable): new contributors have added themselves to the authors list in the CITATION.cff file

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.09%. Comparing base (979990e) to head (fbab084).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
pyprep/find_noisy_channels.py	75.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #169      +/-   ##
==========================================
- Coverage   98.61%   98.09%   -0.53%     
==========================================
  Files           7        7              
  Lines         723      734      +11     
==========================================
+ Hits          713      720       +7     
- Misses         10       14       +4     

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