Refactor mapping users for jira import
What does this MR do?
It extracts code responsible for mapping jira users against gitlab users to a separate class.
We will reuse this code when importing all users at once in the beginning of the Jira importer.
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation (if required) -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Database guides -
Separation of EE specific content
Availability and Testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.