Upload test results to CodeCov

[aik099]

Got an e-mail from CodeCov about a new Test Analytics feature (see https://about.codecov.io/blog/find-failing-and-flaky-tests-with-codecov-test-analytics/ ) and decided to try it out.

Demo: https://app.codecov.io/gh/minkphp/MinkSelenium2Driver/tests/master
To see it in action in this repo please merge this PR first.

P.S.
Copy/paste from minkphp/MinkSelenium2Driver#403 .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.40%. Comparing base (ca55cde) to head (fde03d5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #50   +/-   ##
=========================================
  Coverage     84.40%   84.40%           
  Complexity      196      196           
=========================================
  Files             1        1           
  Lines           500      500           
=========================================
  Hits            422      422           
  Misses           78       78           

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🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles

[uuf6429]

Cool, looking good!