fix: unpublishing a users public page may return a 404 error (resolves #2366)

[jobara]

Resolves #2366

• If a public page is not previewable, unpublishing it will return the user to the dashboard
• Added tests
• Cleaned up some tests to replace hardcoded strings with values from related enums

Prerequisites

If this PR changes PHP code or dependencies:

• I've run composer format and fixed any code formatting issues.
• I've run composer analyze and addressed any static analysis issues.
• I've run php artisan test and ensured that all tests pass.
• I've run composer localize to update localization source files and committed any changes.

If this PR changes CSS or JavaScript code or dependencies:

• I've run npm run lint and fixed any linting issues.
• I've run npm run build and ensured that CSS and JavaScript assets can be compiled.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.90%. Comparing base (1007fd7) to head (16c1d4d).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #2368   +/-   ##
=========================================
  Coverage     96.90%   96.90%           
- Complexity     2193     2195    +2     
=========================================
  Files           341      341           
  Lines         10311    10315    +4     
=========================================
+ Hits           9992     9996    +4     
  Misses          319      319           

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