Add check for proper feature flag task comment for all PR's

[dus7]

Task: https://app.asana.com/1/137249556945/project/1211834678943996/task/1212001845756281?focus=true

Adds a warning when there’s no valid asana task reference for modified FeatureFlag case. Checks both macOS and iOS.

Test PR in apple-browsers repo: duckduckgo/apple-browsers#3632 (comment)

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Note

Low Risk
Limited to CI/Danger warnings and new unit tests; no runtime app behavior changes, but diff-parsing heuristics could produce false positives/negatives.

Overview
Adds a new Danger check (featureFlagAsanaLink) that scans diffs to iOS/Core/FeatureFlag.swift and macOS/.../FeatureFlag.swift and warns when newly-added case entries in enum FeatureFlag lack a valid /// https://app.asana.com/.../task/<id> comment (allowing optional query params) immediately above the added case.

Updates the default Danger run to execute this check, and adds a comprehensive Jest test suite covering valid/invalid links, iOS vs macOS paths, enum-scope detection, brace tracking, and multi-case reporting.

^{Written by Cursor Bugbot for commit 8ce1323. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

[ayoy]

LGTM, the tests are good 👍 I'd consider failing the check instead of showing a warning, since we want to enforce linking feature flags to Asana tasks.

[dus7]

LGTM, the tests are good 👍 I'd consider failing the check instead of showing a warning, since we want to enforce linking feature flags to Asana tasks.

Thanks! Reporting failure is the end goal, but I want to field-test it first for any false positives and not block work if I got it wrong.