fix: ignore context cancel on triggering breaker of httpc

[kevwan]

No description provided.

[Copilot]

Pull request overview

This PR fixes circuit breaker behavior in the HTTP client by preventing context cancellation errors from triggering the breaker. The main change introduces a new acceptable function that distinguishes between different error types to determine whether a request should be considered a failure for circuit breaker purposes.

Key changes:

• Added intelligent error classification in acceptable function to treat context cancellation as acceptable (user-initiated) while treating timeouts and network errors as failures
• Comprehensive test coverage for all error scenarios including wrapped errors, network errors, and various HTTP status codes
• Updated GitHub Copilot instructions with issue management guidelines (documentation update)

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
rest/httpc/service.go	Introduces acceptable function to classify HTTP responses and errors for circuit breaker, distinguishing context cancellation from actual failures
rest/httpc/service_test.go	Adds comprehensive table-driven tests for the acceptable function covering status codes, context errors, network errors, and edge cases
.github/copilot-instructions.md	Adds GitHub issue management section with guidelines for handling issues, translations, and best practices

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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