Rust guard: honor GraphQL authorAssociation in project items

[Copilot]

Project-item integrity labeling in the Rust guard handled REST-style author_association but missed GraphQL authorAssociation, causing GraphQL-backed list_project_items / projects_list items to lose association-derived integrity labels. This change aligns project-item labeling with the existing cross-API helper and finishes the remaining login field-name centralization.

• Project item integrity labeling

  • Replace the direct get_str_or(..., "author_association", "") lookup in response_paths.rs with get_author_association(...).
  • Preserve existing behavior for missing associations while correctly handling both REST snake_case and GraphQL camelCase payloads.

• Field-name centralization

  • Replace the two remaining raw "login" lookups with field_names::LOGIN in:
    • labels/helpers.rs
    • labels/backend.rs

• Coverage for GraphQL payloads

  • Add a focused Rust test proving a project item with content.authorAssociation receives the expected association-derived integrity label.

Example of the core change:

let association = get_author_association(content);
let integrity = author_association_floor_from_str(
    integrity_scope,
    association,
    ctx,
);

• Fixes [rust-guard] Rust Guard: Use get_author_association helper and field_names::LOGIN constant consistently #9687

[Copilot]

Pull request overview

Fixes #9687 by correctly deriving project-item integrity from both REST and GraphQL author-association fields.

Changes:

• Uses the cross-API get_author_association helper.
• Centralizes remaining "login" field lookups.
• Adds focused GraphQL project-item coverage.

Show a summary per file

File	Description
response_paths.rs	Handles camelCase GraphQL associations and adds a regression test.
helpers.rs	Uses the centralized login constant.
backend.rs	Uses the centralized login constant.

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• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Medium