Remove invalid data from issue_tracker_data table

What does this MR do?

In !18639 (merged) we started migrating data for issue trackers and jira from properties field of services table to jira_tracker_data and issue_tracker_data.

We found out that the data were not properly migrated for jira_tracker_data. *_iv values are missing in some cases, mostly for api_url field. This has been fixed in !23621 (merged). We thought (and validated on gitlab.com data) that we don't have the problem for data migrated to issue_tracker_data table.

#198938 (closed), however, reveals that there might be the same problem with issue_tracker_data on customers' instances, too.

The final fix will be reinserting the data correctly but this MR removes the invalid data so that users can use their projects.

The fix is the same as !23621 (merged), we just fix issue_tracker_data instead of jira_tracker_data

Records affected

No records affected on gitlab.com

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: #198938 (closed)