[release/9.4] Simplify GH Models API keys experience #10426
                
     Merged
            
            
          
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Backport of #10424 to release/9.4
/cc @davidfowl @sebastienros
Customer Impact
Simplify usag with a default parameter. Custom error messages to help diagnostic configuration issues related to api keys. Display the parameter as a child resource in the dashboard.
Testing
Added unit tests and manually tested
Risk
New experimental feature, low risk.
Regression?
No