fix(graphql): allow sha argument on CommitCoverageAnalytics.coverageFile

[sentry]

An external client was sending a sha argument to the CommitCoverageAnalytics.coverageFile GraphQL field, which resulted in a GraphQLError because the argument was not defined in the schema. The sha argument is redundant as the commit context is already established by the parent resolver.

This fix updates the GraphQL schema to include sha: String as an optional argument for CommitCoverageAnalytics.coverageFile and modifies the resolver to accept this argument. The sha value is then silently ignored, preventing the GraphQLError for clients sending this redundant argument.

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Fixes API-F0A

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[thomasrockhu-codecov]

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✅ Risk: LOW

This PR adds an optional sha: String argument to the CommitCoverageAnalytics.coverageFile GraphQL field and its resolver, accepting the argument and silently ignoring it so external clients that send a redundant sha no longer trigger a GraphQLError. The schema and resolver changes are consistent (sha=None keyword matches the new optional schema arg), and the ignored-value behaviour matches the PR description. No issues found above the confidence threshold.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.63%. Comparing base (17e0f08) to head (a132a77).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2204   +/-   ##
=======================================
  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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Codecov Report

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

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