chore: remove plugin errors from error const

[wseymour15]

Description

Removes error consts that are outside of the video.js repo. These error consts are being added directly to the contrib-ads and contrib-eme repos.

Specific Changes proposed

• Remove error consts that are used in video.js plugins.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.65%. Comparing base (c2c7f96) to head (f325e16).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8706      +/-   ##
==========================================
- Coverage   83.69%   83.65%   -0.04%     
==========================================
  Files         120      120              
  Lines        7996     7996              
  Branches     1926     1926              
==========================================
- Hits         6692     6689       -3     
- Misses       1304     1307       +3     

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