Add Azure Service Bus Emulator docs for testing

[jeremydmiller]

Summary

• Adds a new documentation page covering how to use the Azure Service Bus Emulator for integration testing, based on Wolverine's own Wolverine.AzureServiceBus.Tests patterns
• Covers Docker Compose setup, emulator Config.json, connection strings, Wolverine configuration with separate management port, a reusable test helper, and a full integration test example
• Adds "Using the Emulator" entry to the Azure Service Bus sidebar navigation

Test plan

• Verify the new page renders correctly with npm run docs
• Confirm sidebar link appears under Azure Service Bus section

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