Support Asana custom IDs
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=579418) </details> <!--IssueSummary end--> ### Proposal Asana has a concept of defining custom ID fields for tasks in a project. This results in a field which is automatically populated by a value in the form of FOO-1234 on every task. It would be great if GitLab finds these IDs in a commit message, additionally to the GID and URL. Description: https://help.asana.com/s/article/id-custom-fields?language=en_US API: https://developers.asana.com/reference/gettaskforcustomid <!-- Label reminders Use the following resources to find the appropriate labels: - Use only one tier label choosing the lowest tier this is intended for - https://gitlab.com/gitlab-org/gitlab/-/labels - https://about.gitlab.com/handbook/product/categories/features/ -->
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