feat(graphql): add partialsCount to ImpactedFile type

[sentry]

This PR addresses the GraphQLError: Cannot query field 'partialsCount' on type 'ImpactedFile'.

The root cause was that the ImpactedFile GraphQL type did not expose a partialsCount field, even though missesCount was available and the underlying service data contained partials information. The client was attempting to query a field that was not defined in the schema for that specific type.

This fix implements the following changes:

1. apps/codecov-api/services/comparison.py: Added a cached_property named partials_count to the ImpactedFile service class. This property calculates the total number of partials by iterating through added_diff_coverage and counting lines marked as 'p', mirroring the existing misses_count logic.
2. apps/codecov-api/graphql_api/types/impacted_file/impacted_file.graphql: Updated the ImpactedFile GraphQL type definition to include partialsCount: Int!.
3. apps/codecov-api/graphql_api/types/impacted_file/impacted_file.py: Implemented a new resolver, resolve_partials_count, decorated with @impacted_file_bindable.field("partialsCount"), to expose the partials_count property from the ImpactedFile service class via the GraphQL API.

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Fixes API-EW0

[codecov]

Codecov Report

❌ Patch coverage is 36.36364% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.62%. Comparing base (a8ec2db) to head (e2c36b5).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/codecov-api/services/comparison.py	25.00%	6 Missing ⚠️
...i/graphql_api/types/impacted_file/impacted_file.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1985      +/-   ##
==========================================
- Coverage   91.63%   91.62%   -0.02%     
==========================================
  Files        1336     1336              
  Lines       53230    53241      +11     
  Branches     1647     1647              
==========================================
+ Hits        48778    48782       +4     
- Misses       4131     4138       +7     
  Partials      321      321              

Flag	Coverage Δ
apiunit	93.96% <36.36%> (-0.03%)	⬇️

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[codecov-notifications]

Codecov Report

❌ Patch coverage is 36.36364% with 7 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/codecov-api/services/comparison.py	25.00%	6 Missing ⚠️
...i/graphql_api/types/impacted_file/impacted_file.py	66.66%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (36.36%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

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