Support new resource decorator armResourceWithParameter

[haiyuazhang]

This PR address the issue PrivateEndpointConnection resource is not generated when migrating service storagesync to new management plain generator

[Copilot]

Pull request overview

This PR adds support for a new built-in resource operation decorator and the @armResourceWithParameter decorator to the Azure Management Generator. These additions enable better handling of resource operations with parameters and built-in operation templates.

• Introduces builtInResourceOperationName decorator for handling built-in resource operations
• Adds armResourceWithParameter decorator support for resources with parameters
• Updates resource model detection to include the new decorator
• Adds test case demonstrating usage with PrivateEndpoints template

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
eng/packages/http-client-csharp-mgmt/generator/TestProjects/Local/Mgmt-TypeSpec/PrivateEndpointConnection.tsp	Adds test case for new PrivateEndpoints resource template with StorageSyncService, removes unused TypeSpec.Rest import
eng/packages/http-client-csharp-mgmt/emitter/src/sdk-context-options.ts	Defines constants for builtInResourceOperation and armResourceWithParameter decorators, adds armResourceWithParameterRegex to additionalDecorators
eng/packages/http-client-csharp-mgmt/emitter/src/resource-detection.ts	Implements parseResourceOperation handling for builtInResourceOperationName decorator, updates getAllResourceModels to detect armResourceWithParameter decorated models