fix(graphql): Add Segments type alias for backward compatibility

[sentry]

This PR addresses the GraphQLError: Unknown type 'Segments' that occurs when older clients query the GraphQL API using ... on Segments.

The root cause was that the GraphQL schema no longer defines a type named Segments; the correct type for the segments field's successful result is SegmentComparisons. However, some clients (like the one that triggered API-EW1) were still using the deprecated Segments type name.

To ensure backward compatibility and prevent schema validation errors for these clients, this change introduces Segments as a type alias for SegmentComparisons within the SegmentsResult union. This allows queries using ... on Segments to pass schema validation, preventing a GraphQLError and allowing the request to proceed (though the Segments fields will resolve to the same data as SegmentComparisons).

Changes include:

• Adding type Segments to segment_comparison.graphql as a duplicate of SegmentComparisons.
• Including Segments in the SegmentsResult union in segment_comparison.graphql.
• Registering segments_bindable = ObjectType("Segments") in segment_comparison.py.
• Exporting and registering segments_bindable in the relevant __init__.py files.

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Fixes API-EW1

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.63%. Comparing base (a8ec2db) to head (053723f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1986   +/-   ##
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  Coverage   91.63%   91.63%           
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  Files        1336     1336           
  Lines       53230    53231    +1     
  Branches     1647     1647           
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+ Hits        48778    48779    +1     
  Misses       4131     4131           
  Partials      321      321           

Flag	Coverage Δ
apiunit	93.99% <100.00%> (+<0.01%)	⬆️

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