Add spector tests for Azure Resource Manager multi-service scenarios

[Copilot]

Adds test coverage for the three multi-service TypeSpec definitions in azure-http-specs/specs/azure/resource-manager/multi-service*.

Changes

• Test configuration: Added spector_arm_multi_service, spector_arm_multi_service_older_versions, and spector_arm_multi_service_shared_models to tspcompile.js

• Test coverage: Created integration tests for each scenario:

  • multi-service: Basic combined client with VirtualMachine (Compute) and Disk (ComputeDisk) services
  • multi-service-older-versions: Combined client using @useDependency to pin specific API versions
  • multi-service-shared-models: Combined client with VirtualMachine (Compute) and StorageAccount (Storage) sharing SharedMetadata model

• Test structure: Each test suite validates:

  • Sub-client accessors (get_combined_virtual_machines_client(), etc.)
  • GET operations for resource retrieval
  • LRO CREATE_OR_UPDATE operations using Poller API
  • Correct use of ResourceProvisioningState enum
  • Shared model serialization (metadata, tags) in shared-models scenario

The tests verify that the emitter correctly generates combined clients exposing operations from multiple Azure service namespaces through a single entry point, following the @client decorator with multiple services pattern.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add spector test for azure-http-specs\specs\azure\resource-manager\multi-service</issue_title>
<issue_description>1. Do not modify the generated rust source code (in src/generated), only modify the emitter code (in /packages/typespec-rust/src/) if necessary
2. Create the test under packages/typespec-rust/test/spector/azure/multi-service/</issue_description>

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

• Fixes Add spector test for azure-http-specs\specs\azure\resource-manager\multi-service\ #823

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