fix: ACNA-2738 - failing e2e tests because of mocked fs

[shazron]

• fixes e2e tests are failing #172
• removed all nodejs:12 references (changed to nodejs:18)
• moved e2e tests into describe blocks

How Has This Been Tested?

• npm run e2e

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f54ebba) 100.00% compared to head (a471a5b) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #173   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines         1300      1300           
  Branches       345       345           
=========================================
  Hits          1300      1300           

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