chore: return a 204 from the profile endpoint when unauthenticated

[guabu]

📋 Changes

This PR adds a noContentProfileResponseWhenUnauthenticated configuration option to return a 204 No Content response from the profile endpoint when the user is not authenticated. This avoids undesirable few cases:

• Automatic retries on errors (401s)
• Clearing of the basic auth state (fixes: v4: useUser/Auth0Provider loses Basic Auth credentials #1933)
• Periodic logging of errors in the console/network tabs when attempting to revalidate while unauthenticated

📎 References

Relevant issue: #1933

🎯 Testing

• PR includes tests for the useUser() hook and server components
• A sample repository for testing can also be found in the issue linked above

[frederikprijck]

Approved as this also aligns more again with v3 as per #791

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.77%. Comparing base (3e5fa12) to head (791a9ba).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2159      +/-   ##
==========================================
+ Coverage   82.66%   82.77%   +0.10%     
==========================================
  Files          21       21              
  Lines        2060     2072      +12     
  Branches      362      367       +5     
==========================================
+ Hits         1703     1715      +12     
  Misses        350      350              
  Partials        7        7              

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