[CI] Temporarily disable codecov comments if PR comes from fork repo

[aobolensk]

If PR comes from fork, it causes an error due to lack of permission to have write access to PR comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.73%. Comparing base (6946a7d) to head (0dd129c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #493   +/-   ##
=======================================
  Coverage   91.73%   91.73%           
=======================================
  Files          11       11           
  Lines         363      363           
  Branches      119      131   +12     
=======================================
  Hits          333      333           
  Misses         10       10           
  Partials       20       20           

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