Remove ROUNDTRIP error references

[shenglol]

Removing references for ROUNDTRIP errors since the ROUNDTRIP correctness KPI is deprecated.

[openapi-pipeline-app]

Next Steps to Merge

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Swagger Validation Report

️️✔️BreakingChange succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️Breaking Change(Cross-Version) succeeded [Detail] [Expand]

There are no breaking changes.

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Validation passes for LintDiff.

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Validation passes for Avocado.

️️✔️SwaggerAPIView succeeded [Detail] [Expand]

️️✔️TypeSpecAPIView succeeded [Detail] [Expand]

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Validation passes for ModelValidation.

️️✔️SemanticValidation succeeded [Detail] [Expand]

Validation passes for SemanticValidation.

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_{Posted by Swagger Pipeline | How to fix these errors?}

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[shenglol]

@raych1 Thanks for approving. Do you mind helping merge the PR since I don't have write access.

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