[ViPPET] Fix GPU device name check to support multiple GPU identifiers

[ktaube26]

Description

This PR fixes a device name comparison issue in the ViPPET video encoder to support multiple GPU identifier formats. The change replaces an exact string match with a prefix match, allowing device names like "GPU.0", "GPU.1", etc., to be correctly identified as GPU devices.

Key Changes:

• Modified GPU device detection logic to use startswith() instead of exact equality check

Checklist:

• I agree to use the APACHE-2.0 license for my code changes.
• I have not introduced any 3rd party components incompatible with APACHE-2.0.
• I have not included any company confidential information, trade secret, password or security token.
• I have performed a self-review of my code.

[Copilot]

Pull request overview

This PR fixes a device name comparison issue in the ViPPET video encoder to support multiple GPU identifier formats. The change replaces an exact string match with a prefix match, allowing device names like "GPU0", "GPU1", etc., to be correctly identified as GPU devices.

Key Changes:

• Modified GPU device detection logic to use startswith() instead of exact equality check

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