Add context_path when using custom Jira requests

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In !49623 (merged) we are fixing a problem that occurs when we send requests to a Jira instance that runs on a sub-path (e.g. jira.example.com/jira-subpath).

We should identify all places in the codebase where we use jira_client.get or jira_client.post and make sure the request path includes the sub-path

• app/services/jira/requests/base.rb#L39 (MR: !49623 (merged))
• app/services/jira_import/users_importer.rb#L40
• app/services/jira_import/users_mapper_service.rb#L35
• lib/gitlab/jira_import/labels_importer.rb#L42