Makes test failure issue creation confidential
What does this MR do?
Due to possible sensitive information being displayed in the screenshot attached in the failure issues, this updates relate-failure-issue
command to create test failure issues as confidential.
Related to https://gitlab.com/gitlab-org/gitlab/-/issues/441310#note_1792108973
Check-list
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Ensure commits include Changelog:
trailer -
Verify the change in all affected pipelines.
Edited by Richard Chong