Remove variables from qa-user-project-cleanup job

What does this MR do?

Removes USER_ID and GITLAB_ADDRESS variables from qa-user-project-cleanup job. This was overriding GITLAB_ADDRESS defined in the live environments where this job runs. (e.g. staging) and the USER_ID was not the gitlab-qa user for this environment. These should be defined on the live environments and in the scheduled jobs since they're different for each live environment.

Relates to gitlab-org/gitlab!139846 (merged)

Part of gitlab-org/quality/quality-engineering&24

Check-list

• Ensure commits include Changelog: trailer
• Verify the change in all affected pipelines.