Remove the 'Windows_arm64 plugin_test' Devicelab test (#136379)

This removes the `Windows_arm64 plugin_test` as Devicelab tests aren't able to target Android from a Windows Arm64 host yet. I opened https://github.com/flutter/flutter/issues/136378 to track this work.

.ci.yaml

@@ -4813,26 +4813,6 @@ targets:
       - bin/**
       - .ci.yaml
 
-  - name: Windows_arm64 plugin_test
-    recipe: devicelab/devicelab_drone
-    bringup: true # https://github.com/flutter/flutter/issues/134083
-    timeout: 60
-    properties:
-      dependencies: >-
-        [
-          {"dependency": "android_sdk", "version": "version:33v6"},
-          {"dependency": "chrome_and_driver", "version": "version:117.0"},
-          {"dependency": "open_jdk", "version": "version:11"}
-        ]
-      tags: >
-        ["devicelab", "hostonly", "windows", "arm64"]
-      task_name: plugin_test
-    runIf:
-      - dev/**
-      - packages/flutter_tools/**
-      - bin/**
-      - .ci.yaml
-
   - name: Windows plugin_test_windows
     recipe: devicelab/devicelab_drone
     timeout: 60