[ci] Disable Windows Arm64 stable CI (#5217)

The Windows Arm64 build-only stable test is currently failing as the necessary build layout migration hasn't landed on stable yet: flutter/flutter@792e26d

This test can be re-added after the next Flutter stable release. This is tracked by flutter/flutter#129813

Author: loic-sharma

.ci.yaml

@@ -1107,20 +1107,6 @@ targets:
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
 
-  - name: Windows_arm64 windows-build_all_packages stable
-    recipe: packages/packages
-    timeout: 30
-    bringup: true # https://github.com/flutter/flutter/issues/134083
-    properties:
-      add_recipes_cq: "true"
-      target_file: windows_build_all_packages.yaml
-      channel: stable
-      version_file: flutter_stable.version
-      dependencies: >
-        [
-          {"dependency": "vs_build", "version": "version:vs2019"}
-        ]
-
   - name: Windows_x64 repo_tools_tests
     recipe: packages/packages
     timeout: 30