DXCDT-501: auth0 tf generate end-to-end tests

[willvedd]

🔧 Changes

Adding E2E test cases to the auth0 tf generate command.

Four major cases covered:

• Full success of TF config generation, targeting single resource
• Full success of TF config generation, targeting all resources
• Partial success if Terraform provider credentials not initialized
• Validation errors when invalid config provided

One thing to note is that we're reusing the Auth0 CLI client, used for facilitating connection between CLI and tenant for the Terraform provider too. This is not a best practice but a major convenience in testing; preventing us needing to initialize and manage credentials of another client.

🔬 Testing

Four new end-to-end test cases added.

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.69% 🎉

Comparison is base (000005c) 72.64% compared to head (52b24e2) 73.34%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #848      +/-   ##
==========================================
+ Coverage   72.64%   73.34%   +0.69%     
==========================================
  Files          92       92              
  Lines       11842    11847       +5     
==========================================
+ Hits         8603     8689      +86     
+ Misses       2733     2644      -89     
- Partials      506      514       +8     

Files Changed	Coverage Δ
internal/cli/terraform_fetcher.go	98.03% <ø> (ø)
internal/cli/terraform.go	87.17% <100.00%> (+26.26%)	⬆️

... and 2 files with indirect coverage changes

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