Add test cases for @convenientAPI and @protocolAPI at namespace and interface levels

[Copilot]

The @convenientAPI and @protocolAPI decorators lacked test coverage for namespace and interface level application, only being tested on individual operations.

Changes

Added specs/azure/client-generator-core/convenient-api/ with test cases covering:

• Namespace level decorators: @convenientAPI(false) and @protocolAPI(false) applied to namespaces containing multiple operations
• Interface level decorators: @convenientAPI(false) and @protocolAPI(false) applied to interfaces within namespaces

Each test case includes:

• TypeSpec scenario definitions with proper documentation
• Mock API handlers for GET and POST operations
• Consistent request/response patterns for validation

Example usage in the test:

@convenientAPI(false)
namespace ConvenientNamespace {
  @route("/operation1")
  @get
  op operation1(@query name: string): TestModel;
  
  @route("/operation2")
  @post
  op operation2(@query name: string): TestModel;
}

This validates that SDK generators correctly handle decorator inheritance from namespace/interface scope to contained operations.

Original prompt

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This section details on the original issue you should resolve

<issue_title>add new cases for decorator @convenientAPI & @protocolAPI applied at the namespace + interface level</issue_title>
<issue_description>The protocolAPI decorator docs are here and the convenientAPI decorator docs are here.

Goal:
Add test case in folder https://github.com/Azure/typespec-azure/tree/main/packages/azure-http-specs/specs/azure/client-generator-core

Ask:

Add cases:

• applying each decorator at the namespace level
• applying each decorate at the interface level</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes add new cases for decorator @convenientAPI & @protocolAPI applied at the namespace + interface level #3640

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