Remove unused upstream notification code
What does this MR do and why?
We stopped notifying upstream now that we use native triggers.
Related to https://gitlab.com/gitlab-org/quality/engineering-productivity/team/-/issues/91.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by George Koltsov