Bitbucket Server Importer fails when pull request is deleted during migration

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Currently, when a pull request is deleted in Bitbucket Server while a migration is in progress via Bitbucket Server Importer, the migration process fails with the following error:

Error 404: No pull request exists with ID XXX for this repository XXX

This occurs specifically during the execution of Gitlab::BitbucketServerImport::Stage::ImportNotesWorker when it attempts to fetch activities for pull requests.

Expected Behavior: The Bitbucket Server Importer should gracefully handle deleted pull requests and continue with the migration process.

Current Behavior: The migration fails when encountering a deleted pull request.

Suggested Solution:

Implement error handling in the Bitbucket Server Importer to:

• Detect when a pull request has been deleted
• Skip the deleted pull request
• Continue with the remaining items in the migration