test(add): add e2e test - basic path

[Katka92]

Creating a new branch in the konflux-ui to properly test changes in GitHub actions.
Adding Basic e2e test.
Updating README in e2e-tests folder.

Note: 90% of this code is copy-pasted from a hac-dev repository.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.92%. Comparing base (eabc80b) to head (a087124).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   79.92%   79.92%           
=======================================
  Files         568      568           
  Lines       21329    21329           
  Branches     5285     5285           
=======================================
  Hits        17048    17048           
  Misses       4257     4257           
  Partials       24       24           

Flag	Coverage Δ
unittests	79.92% <ø> (ø)

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