Refactor Azure.Mcp.Tools.EventHubs for dependency injection

[Copilot]

• Refactor NamespaceGetCommand to inject IEventHubsService via constructor
• Refactor NamespaceDeleteCommand to inject IEventHubsService via constructor
• Refactor NamespaceUpdateCommand to inject IEventHubsService via constructor
• Refactor ConsumerGroupDeleteCommand to inject IEventHubsService via constructor
• Refactor ConsumerGroupGetCommand to inject IEventHubsService via constructor
• Refactor ConsumerGroupUpdateCommand to inject IEventHubsService via constructor
• Update unit tests for all 6 commands to pass service via constructor
• Build succeeds with 0 warnings, all 93 unit tests pass
• Add changelog entry with PR number (Refactor Azure.Mcp.Tools.EventHubs for dependency injection #1986)

Original prompt

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This section details on the original issue you should resolve

<issue_title>DI Refactor: Azure.Mcp.Tools.EventHubs</issue_title>
<issue_description>## Summary

Refactor Azure.Mcp.Tools.EventHubs to use constructor dependency injection instead of resolving services via context.GetService<T>() in ExecuteAsync.

This is a sub-issue of #158.

Instructions

Follow the algorithm described in tools/di-refactor-plan.md with {ToolArea} = EventHubs.

An example PR is: #1815
</issue_description>

<agent_instructions>After creating PR, re-evaluate Step 5. Step 5 includes executing New-ChangeLogEntry.ps1 to generate CHANGELOG entry.</agent_instructions>

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

• Fixes DI Refactor: Azure.Mcp.Tools.EventHubs #1851

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[conniey]

@copilot There are no files changed

[Copilot]

@copilot There are no files changed

Done! Commit 87bb556 refactors all 6 remaining commands (NamespaceGetCommand, NamespaceDeleteCommand, NamespaceUpdateCommand, ConsumerGroupDeleteCommand, ConsumerGroupGetCommand, ConsumerGroupUpdateCommand) to accept IEventHubsService via constructor injection instead of calling context.GetService<IEventHubsService>() in ExecuteAsync. Unit tests updated accordingly — all 93 tests pass.

[conniey]

@copilot Step 5 includes executing New-ChangeLogEntry.ps1 to generate CHANGELOG entry. There is no PR number in this yml file.

[Copilot]

Added pr: 1986 to the changelog entry in commit 5ed7d72.