Codecov: remove token, turn off CI failure

[jotak]

See also: netobserv/network-observability-console-plugin#531

Also, align the workflow file with other repos

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.52%. Comparing base (fdb4eb1) to head (e6acd78).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #667   +/-   ##
=======================================
  Coverage   66.52%   66.52%           
=======================================
  Files         104      104           
  Lines        6658     6658           
=======================================
  Hits         4429     4429           
  Misses       1915     1915           
  Partials      314      314           

Flag	Coverage Δ
unittests	66.52% <ø> (ø)

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