fix(graphql): prevent client validation errors from Sentry logging

[sentry]

This PR addresses an issue where GraphQL client-side validation errors (e.g., invalid fragment spreads, unknown fields, syntax errors) were being incorrectly logged to Sentry as "internal server errors."

Problem:
GraphQL validation errors, which are client-side issues, manifest as GraphQLError instances where the original_error attribute is None. The previous error_formatter logic in graphql_api/views.py only explicitly recognized a specific string match ("Cannot query field") as a client error. All other GraphQLError instances with original_error = None would fall into a generic else block, leading to log.error() and capture_exception() calls, treating them as unexpected internal server errors.

Solution:
Modified the error_formatter in apps/codecov-api/graphql_api/views.py to explicitly check if error.original_error is None. If this condition is met, it indicates a client-side GraphQL validation error. In such cases, the formatter now returns the actual GraphQL validation message to the client (via format_error(error, debug)) and avoids logging these errors to Sentry.

The redundant is_bad_query string-match heuristic has also been removed as it is no longer necessary with the more comprehensive original_error is None check.

Impact:

• Reduces Sentry noise by preventing client-side GraphQL validation errors from being reported as internal server errors.
• Provides more accurate and helpful error messages to API consumers when their GraphQL queries are invalid.

Legal Boilerplate

Look, I get it. The entity doing business as "Codecov" is owned by Harness, Inc. In 2026 Harness acquired Codecov and as a result Harness is going to need some rights from me in order to utilize my contributions in this PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Harness can use, modify, copy, and redistribute my contributions, under Harness's choice of terms.

Fixes API-EZP

_{This PR was automatically generated by Sentry. You can adjust this setting at any time.}

[thomasrockhu-codecov]

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