fix(typescript): ignore pagination field mismatches in wire test mock server

[jsklan]

Description

Refs: Customer bug report (Square)

Fixes wire test failures when pagination tests call getNextPage(). The SDK correctly sends the cursor/offset from the response, but the mock server was rejecting the request because the value didn't match the original request body.

Link to Devin run: https://app.devin.ai/sessions/569f5162819c47c4ba95afbfde8313de
Requested by: @jsklan

Changes Made

• Added WithJsonOptions interface to withJson.ts with an ignoredFields parameter for specifying fields to ignore during request body comparison
• Removed hardcoded !key.startsWith("pagination.") filtering from withJson.ts (per reviewer feedback)
• Updated mockEndpointBuilder.ts to pass ignoredFields through the jsonBody method
• Updated TestGenerator.ts to extract pagination field paths from the IR for both cursor AND offset pagination types, building the full path (e.g., "pagination.cursor", "cursor", "pagination.offset")
• Added test fixture listWithTopLevelBodyCursorPagination with a top-level cursor field in the request body to demonstrate the bug
• Updated IR generator test snapshots for the pagination fixture
• Updated README.md generator (not applicable)

Testing

• Seed tests pass for pagination fixture (2/2 test cases)
• Verified generated tests include correct ignoredFields for both top-level and nested pagination fields
• Manual testing completed against customer's Square SDK - all 659 tests pass
• IR generator test snapshots updated

Updates Since Last Revision

• Addressed reviewer feedback to remove hardcoded pagination. filtering from withJson.ts
• Updated TestGenerator.ts to build full paths for ALL pagination types (cursor and offset), not just top-level cursor fields
• Uses originalName for PropertyPathItem.name and wireValue for property.name to correctly construct field paths
• Updated IR generator test snapshots (pagination.json in dynamic-snippets and ir test-definitions)

Human Review Checklist

• Verify the path construction logic in TestGenerator.ts correctly handles both nested paths (e.g., pagination.cursor) and top-level paths (e.g., cursor)
• Verify the type distinction: PropertyPathItem.name uses originalName, while property.name uses wireValue
• Confirm offset pagination tests still pass (the pagination.offset field should now be in ignoredFields)
• Verify the new listWithTopLevelBodyCursorPagination endpoint properly demonstrates the bug

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[fern-support]

can we push pagination. into the tests themselves instead of the helpers?