Update system note to use delivery tracker
What does this MR do and why?
The system note appended in our messages states issues should be open on the release-tools project, but the issues were disabled as part of gitlab-com/gl-infra/delivery#1001 (closed). This was documented on !2714 (merged).
This commit updates our system note to reflect that.
Author Check-list
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Has documentation been updated?
Edited by Jenny Kim