update cypress docs

[christianvogt]

Description

Fix cypress npm run cypress:open:mock example command line.

Update description of dir structure for cypress tests to include e2e and mocked test dirs.

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.48%. Comparing base (7048a18) to head (c2c479b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2864   +/-   ##
=======================================
  Coverage   77.48%   77.48%           
=======================================
  Files        1110     1110           
  Lines       23482    23482           
  Branches     5917     5917           
=======================================
+ Hits        18194    18196    +2     
+ Misses       5288     5286    -2     

see 1 file with indirect coverage changes

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