Mention the branding suffix in the error message when no entry can be found in CMOR tables

[bouweandela]

Description

Mention the branding suffix in the error message when no entry can be found in CMOR tables.

As suggested in #2946 (comment)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.16%. Comparing base (e4bd4b1) to head (a1823da).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3083   +/-   ##
=======================================
  Coverage   96.16%   96.16%           
=======================================
  Files         270      270           
  Lines       15824    15825    +1     
=======================================
+ Hits        15217    15218    +1     
  Misses        607      607           

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[schlunma]

Thanks!!