Add unit tests for UseHttpPutForUpdate setting

[Copilot]

Adds comprehensive test coverage for the UseHttpPutForUpdate setting introduced to control default update verb behavior.

Test Coverage

• EntityPathItemHandler: Verifies setting controls PUT vs PATCH for entity updates
• NavigationPropertyPathItemHandler: Tests both single and collection navigation property updates
• ComplexPropertyItemHandler: Validates update method selection for complex properties
• Annotation precedence: Confirms UpdateRestrictions annotations override the global setting

All tests verify:

1. Default behavior (UseHttpPutForUpdate = false) uses PATCH
2. Enabled setting (UseHttpPutForUpdate = true) uses PUT
3. Explicit UpdateMethod annotations take precedence over setting

var settings = new OpenApiConvertSettings
{
    UseHttpPutForUpdate = true  // Use PUT instead of PATCH for updates
};
var document = model.ConvertToOpenApi(settings);

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud