Fix stable pipeline trigger to only use tags

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bschnurr

build/azure-devdiv-pipeline.stable.yml

@@ -1,8 +1,5 @@
 name: Publish Release
 trigger:
-  branches:
-    include:
-      - release*
   tags:
     include: ['*']
 pr: none