ciflow/trunk/196228: [ci] Install TorchTitan VLM test requirements

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The TorchTitan qwen3.5 integration imports fla, but the test setup only installs the core and pytest dependencies. Install TorchTitan's VLM requirements from the cloned checkout so flash-linear-attention is available. Keep this CI unblock separate from the Dynamo typing commit because it addresses a broken-trunk failure reproduced on the exact viable/strict base. Installing the focused requirements file avoids chang…

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