Remove the ErrorResponse class from the summary types package to simplify error handling patterns and align with standardized error response structures across the SDK.

This is a breaking change that affects consumers who were directly importing or referencing the ErrorResponse type from the summary package. Applications should migrate to use the standardized error handling mechanisms provided by the core SDK client.

Key changes:
- Remove ErrorResponse class from com.phenoml.api.resources.summary.types package
- Eliminate custom error response structure with success and error fields
- Streamline error handling to use SDK-wide standardized patterns

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