Moves notification note to the implementation issue
What does this MR do?
Moves the notification note from the MR targeting master
to the security implementation issue.
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When merge requests are being processed and they can't be merged for some reason, a note is generated on the MR targeting master. Since we now merged MRs targeting master earlier, the note could be easily ignored. This commit moves the note to the implementation issue
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It also sets the client to always be the security one
Related to gitlab-com/gl-infra/delivery#1177 (closed) and to gitlab-com/gl-infra/delivery#1122 (closed)