[xcode16][ci] Move CI to use stable bots

tools/devops/automation/build-pipeline.yml

@@ -249,7 +249,7 @@ extends:
     stages:
       - template: templates/main-stage.yml
         parameters:
-          xcodeChannel: Beta
+          xcodeChannel: Stable
           macOSName: ${{ parameters.macOSName }}
           isPR: false
           provisionatorChannel: ${{ parameters.provisionatorChannel }}

tools/devops/automation/build-pull-request.yml

@@ -237,7 +237,7 @@ extends:
     stages:
     - template: templates/main-stage.yml
       parameters:
-        xcodeChannel: Beta
+        xcodeChannel: Stable
         macOSName: ${{ parameters.macOSName }}
         isPR: true
         provisionatorChannel: ${{ parameters.provisionatorChannel }}

tools/devops/automation/templates/pipelines/api-diff-pipeline.yml

@@ -73,7 +73,7 @@ variables:
 stages:
 - template: ../api-diff-stage.yml
   parameters:
-    xcodeChannel: Beta
+    xcodeChannel: Stable
     macOSName: ${{ parameters.macOSName }}
     isPR: ${{ parameters.isPR }}
     provisionatorChannel: ${{ parameters.provisionatorChannel }}

tools/devops/automation/templates/pipelines/run-tests-pipeline.yml

@@ -182,7 +182,7 @@ variables:
 stages:
   - template: ../tests-stage.yml
     parameters:
-      xcodeChannel: Beta
+      xcodeChannel: Stable
       macOSName: ${{ parameters.macOSName }}
       isPR: ${{ parameters.isPR }}
       provisionatorChannel: ${{ parameters.provisionatorChannel }}