[NO MERGE] Perform a test CI run for macOS 26 against release/8.0-staging

Author: jeffhandley

eng/pipelines/coreclr/templates/helix-queues-setup.yml

@@ -108,6 +108,7 @@ jobs:
     - ${{ if eq(parameters.platform, 'osx_arm64') }}:
       - ${{ if eq(variables['System.TeamProject'], 'public') }}:
         - OSX.1200.ARM64.Open
+        - OSX.26.Arm64.Open
       - ${{ if eq(variables['System.TeamProject'], 'internal') }}:
         - OSX.1200.ARM64
 

eng/pipelines/extra-platforms/runtime-extra-platforms-other.yml

@@ -58,6 +58,7 @@ jobs:
     - linux_arm64
     - linux_musl_x64
     - osx_x64
+    - osx_arm64
     - windows_x64
     - windows_x86
     - windows_arm64

eng/pipelines/libraries/helix-queues-setup.yml

@@ -84,6 +84,7 @@ jobs:
     # OSX arm64
     - ${{ if eq(parameters.platform, 'osx_arm64') }}:
       - OSX.1200.ARM64.Open
+      - OSX.26.Arm64.Open
 
     # OSX x64
     - ${{ if eq(parameters.platform, 'osx_x64') }}: