Use jira import owner as the issue author

What does this MR do?

Now the project.creator is used as the author of issues created during the Jira import. We should set the value to the user who ran the import instead.

This MR takes the owner of an import and sets them as the issues author.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.

Issue #215569 (closed)