temporary fix intake-esgf online tests: remove/xfail CanESM5 that now returns incompatible STAC indices

[valeriupredoi]

Description

Closes #3222

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.47%. Comparing base (2f24941) to head (5f024a2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3223      +/-   ##
==========================================
- Coverage   96.48%   96.47%   -0.01%     
==========================================
  Files         282      282              
  Lines       16418    16418              
==========================================
- Hits        15841    15840       -1     
- Misses        577      578       +1     

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[valeriupredoi]

@bouweandela this is how I propose we fix the testing issue for now - BTW mypy is a real PITA, sometimes - not often, but sometimes - one really needs commented out code!

[valeriupredoi]

superseded by using the upcoming release of intake-esgf, and fixes put in by @bouweandela in #3225