Test262 TODO: Object.prototype.__proto__

[rogeralsing]

Summary

• fix Object.prototype.proto setter to propagate abrupt completions and reject non-extensible/cycle updates
• enforce [[SetPrototypeOf]] failure on non-extensible objects
• remove non-standard Object.prototype stubs for getPrototypeOf/setPrototypeOf/proto from compat data

Tests

• dotnet test tests/Asynkron.JsEngine.Tests.Test262 -c Release --settings tests/Asynkron.JsEngine.Tests.Test262/BuiltInsTests.runsettings --filter "Name=Object_prototype___proto__"

[rogeralsing]

Fixed in 0f222b9.\n\nTests:\n- dotnet test tests/Asynkron.JsEngine.Tests.Test262 -c Release --settings tests/Asynkron.JsEngine.Tests.Test262/BuiltInsTests.runsettings --filter "Name=Object_prototype___proto__"