Ensure Bitbucket Cloud PR notes importer is retriable
<!--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=518643) </details> <!--IssueSummary end--> This is a follow-up from https://gitlab.com/gitlab-org/gitlab/-/issues/448895. The pull request notes worker should be updated to be retriable, similar to how the pull request worker was made retriable in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/156797.
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