fix: Enhance error handling and integrate GraphQL interceptor

[maciaszczykm]

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• If required, I have updated the Plural documentation accordingly.
• I have added tests to cover my changes.
• I have added a meaningful title and summary to convey the impact of this PR to a user.
• I have added relevant labels to this PR to help with categorization for release notes.

[linear]

PROD-5156

[maciaszczykm]

@greptileai

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no actionable correctness, security, or repository-rule issues identified.

Summary

• Adds a shared GraphQL error formatter and request interceptor.
• Preserves GraphQL response errors through errors.Is and errors.As.
• Produces concise messages for GraphQL failures and HTTP status failures.
• Makes Console error matching safe for nil response lists and entries.
• Adds integration and unit coverage for formatting, wrapping, interceptor composition, and matching behavior.

_{Reviews (1) · Last reviewed commit: "enhance error handling and integrate Gra..."}