DXCDT-587: Warn if deleting client used to authenticate

[willvedd]

🔧 Changes

This PR adds a warning message communicating to the user that they're about to delete the client used to authenticate the CLI. This doesn't have immediate ramifications for the CLI but will prevent the CLI from being able to re-authenticate once the access token eventually expires.

We had considered preventing the user from deleting the application altogether, but there are some valid use-cases for this behavior.

📝 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

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (ed632b4) 72.31% compared to head (4db5057) 72.29%.

Files	Patch %	Lines
internal/cli/apps.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #934      +/-   ##
==========================================
- Coverage   72.31%   72.29%   -0.02%     
==========================================
  Files          92       92              
  Lines       12500    12503       +3     
==========================================
  Hits         9039     9039              
- Misses       2930     2933       +3     
  Partials      531      531              

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