ENH: allow specifying ransac at class inst of NoisyChannels

[sappelhoff]

PR Description

This PR allows specifying ransac (True/False) not only when calling find_all_bads, but also at instantiation of the class NoisyChannels.

All changes here are fully backward compatible.

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.61%. Comparing base (5fa005b) to head (03f83d2).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   98.60%   98.61%   +0.01%     
==========================================
  Files           7        7              
  Lines         715      721       +6     
==========================================
+ Hits          705      711       +6     
  Misses         10       10              

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