Codecov Tokenless upload

[AndreKurait]

We moved to a more complex workflow_run trigger due to issues codecov had with tokenless uploads for the past few months.

This was reported in codecov/codecov-action#1580 and recently resolved with version 5.0.7.

This change moves back to tokenless uploads which reduces risk and makes it easier to test any future updates and adds some support for codecov updates even with some test failures.

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.76%. Comparing base (d5b401c) to head (0c3acd7).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1155   +/-   ##
=========================================
  Coverage     80.76%   80.76%           
  Complexity     2948     2948           
=========================================
  Files           400      400           
  Lines         15104    15104           
  Branches       1021     1021           
=========================================
  Hits          12199    12199           
  Misses         2288     2288           
  Partials        617      617           

Flag	Coverage Δ
unittests	80.76% <ø> (ø)

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