fix(graphql): accept ref argument on CommitCoverageAnalytics.coverageFile

[sentry]

An external client was sending a GraphQL query to CommitCoverageAnalytics.coverageFile with an unsupported ref argument, leading to GraphQLError: Unknown argument 'ref'.

This change updates the GraphQL schema and resolver for coverageFile to accept ref as an optional String argument. The argument is accepted but ignored, as the commit context is already provided by the parent commit(id:...) field, making the ref redundant. This prevents the GraphQL validation error for clients sending this legacy argument.

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Fixes API-F09

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[thomasrockhu-codecov]

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✅ Risk: LOW

This PR adds an optional ref: String argument to the CommitCoverageAnalytics.coverageFile GraphQL field and threads a matching ref=None keyword into the resolve_coverage_file resolver. The argument is intentionally accepted-and-ignored to unblock a legacy external client that was hitting Unknown argument 'ref'; the commit context still comes from the parent commit(id:...) field, so the resolver behavior is unchanged. The schema and resolver signatures stay in sync and the added parameter has a safe default, so there is nothing to fix.

No issues found above the confidence threshold.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.63%. Comparing base (17e0f08) to head (c217e5c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2203   +/-   ##
=======================================
  Coverage   91.63%   91.63%           
=======================================
  Files        1337     1337           
  Lines       53262    53262           
  Branches     1647     1647           
=======================================
  Hits        48805    48805           
  Misses       4136     4136           
  Partials      321      321           

Flag	Coverage Δ
apiunit	93.98% <100.00%> (ø)

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