Remove deprecated CMOR fix/check code

[schlunma]

Description

This PR removes deprecated features related to CMOR fixes and checks that have been deprecated in v2.10.0 and are scheduled for removal in v2.12.0. See #2157 for details.

Backwards-incompatible changes #

• Option automatic_fixes of CMORCheck: use the functions fix_metadata, fix_data, or Dataset.load (which automatically includes the first two functions) instead. CMOR Checks will not include fixes anymore in the future.
• Option check_level in fix_metadata and fix_data: use the functions cmor_check_metadata, cmor_check_data, or cmor_check instead. Fixes will not check the data anymore in the future.

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Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.92%. Comparing base (fd82b43) to head (b759d56).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2552   +/-   ##
=======================================
  Coverage   94.91%   94.92%           
=======================================
  Files         251      251           
  Lines       14301    14274   -27     
=======================================
- Hits        13574    13549   -25     
+ Misses        727      725    -2     

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[valeriupredoi]

cheers muchly, Manu 🍺