Upload coverage for pull requests from forks from CircleCI

[bouweandela]

Description

Alternative solution to #3181, which does not require running the tests twice.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.48%. Comparing base (b5c5dd5) to head (e21aee1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3201   +/-   ##
=======================================
  Coverage   96.47%   96.48%           
=======================================
  Files         282      282           
  Lines       16407    16407           
=======================================
+ Hits        15829    15830    +1     
+ Misses        578      577    -1     

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[bouweandela]

Tested with branch in ESMValGroup repo in #3203, both cases seem to work fine.

[valeriupredoi]

if you could fix the conflicts, pls bud 🍺 - I'd have gladly done so myself, but you have it as a fork PR, and I think I know why 😁

[valeriupredoi]

thank you, good sir! 🍻