Add IDevID validation for Unary Bootz, and remove redundant interceptor.

[Chounoki]

No description provided.

[gemini-code-assist]

Code Review

This pull request removes the unused InterceptorOpts struct and associated logic from the server, and introduces IDevID certificate validation for both the GetBootstrapData and ReportStatus endpoints. The validateIDevID function has been refactored to support Unary Bootz by extracting peer certificates from the TLS context, as well as Streaming Bootz by manually validating the trust chain. The review feedback suggests adding a defensive nil check for the chassis parameter in validateIDevID to prevent potential nil pointer dereferences, and correcting a typo ('turst' to 'trust') in a code comment.

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