Run outerloop pipeline only for release branches, not staging/preview (#115011)

I noticed we were sending 30k workitems each day to various Helix queues, this is due to the outerloop pipeline having a schedule triggere which matches old preview branches or the staging branches.

This fixes that and also sets it so that the trigger only applies if there are actual source changes.

Co-authored-by: Alexander Köplinger <alex.koeplinger@outlook.com>

Author: github-actions[bot]

eng/pipelines/libraries/outerloop-mono.yml

@@ -6,6 +6,7 @@ schedules:
   branches:
     include:
     - main
+  always: false # run only if there were changes since the last successful scheduled run.
 
 variables:
   - template: variables.yml

eng/pipelines/libraries/outerloop.yml

@@ -6,7 +6,8 @@ schedules:
   branches:
     include:
     - main
-    - release/*.*
+    - release/*.0
+  always: false # run only if there were changes since the last successful scheduled run.
 
 variables:
   - template: variables.yml