Add C# emitter regression coverage for model-level API version filtering

[Copilot]

The reported behavior emitted models marked @added(v2) when targeting v1, despite correctly excluding v2 properties. The current implementation already filters both correctly; this PR adds regression coverage without changing production code.

• Version selection: Cover explicit v1/v2, latest, and default selection.
• Availability: Assert model-level @added and @removed, alongside property-level @added.
• Unreferenced models: Assign @usage so assertions exercise version filtering rather than omission of unused types.

• Fixes [Bug]: unexpected versioning behavior in http-client-csharp emitter #8060

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[Copilot]

🔵 Needs a closer look

The undefined case does not exercise the shipped emitter’s default version selection.

Pull request overview

Adds C# emitter regression coverage for model- and property-level API version filtering without production changes.

Changes:

• Tests explicit, latest, and default version selection.
• Verifies model @added/@removed and property @added behavior.
• Covers unreferenced models.

File summaries

File	Description
packages/http-client-csharp/emitter/test/Unit/client-model-builder.test.ts	Adds API-version filtering regression tests.

Review details

Suppressed comments (1)

packages/http-client-csharp/emitter/test/Unit/client-model-builder.test.ts:610

• The undefined case does not exercise the emitter's default selection: this test calls createSdkContext directly, while the shipped emitter first runs resolveOptions (src/emitter.ts:50), where defaultOptions supplies api-version: "latest" (src/options.ts:168-191). As written, it tests TCGC with an explicitly undefined option rather than the C# emitter default; resolve the options or drive the emitter entrypoint for this case.

      const context = createEmitterContext(program, { "api-version": apiVersion });

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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