APP-9677: Fixed type for LineageListRequest.relation_attributes to be Optional[List[str]]

[Aryamanz29]

https://atlanhq.atlassian.net/browse/APP-9677

Closes #756

🧩 Type of change

Select all that apply:

• 🚀 New feature (non-breaking change that adds functionality)
• 🐛 Bug fix (non-breaking change that fixes an issue) — please include tests! Refer testing-toolkit 🧪
• 🔄 Refactor (code change that neither fixes a bug nor adds a feature)
• 🧹 Maintenance (chores, cleanup, minor improvements)
• 💥 Breaking change (fix or feature that may break existing functionality)
• 📦 Dependency upgrade/downgrade
• 📚 Documentation updates

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Note

Change LineageListRequest.relation_attributes to Optional[List[str]] and propagate via FluentLineage.includes_on_relations, with corresponding unit test updates.

• Lineage model:
  • Change LineageListRequest.relation_attributes type from Optional[str] to Optional[List[str]].
• FluentLineage:
  • Populate request.relation_attributes from includes_on_relations (supports str, AtlanField, or lists).
• Tests:
  • Add import for LineageListRequest and new cases validating relation_attributes population.
  • Extend bad-parameter validations to cover includes_on_relations.
  • Minor variable renames to align with new fields.

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[Copilot]

Pull Request Overview

This PR adds support for relation attributes in lineage queries by introducing the includes_on_relations parameter to FluentLineage and fixing the type of relation_attributes in LineageListRequest.

• Fixed relation_attributes field type from Optional[str] to Optional[List[str]] in LineageListRequest
• Added includes_on_relations parameter support to FluentLineage for specifying attributes to retrieve on related assets
• Added comprehensive test coverage for the new includes_on_relations functionality

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
pyatlan/model/lineage.py	Fixed relation_attributes type from str to List[str] to correctly represent a list of attributes
tests/unit/test_lineage.py	Added import for LineageListRequest, corrected variable naming from GOOD_INCLUDE_ON_RESULTS to GOOD_INCLUDES_ON_RESULTS, added GOOD_INCLUDES_ON_RELATIONS constant, updated all test cases to include the new parameter, and added new test test_init_and_request_for_includes_on_relations

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