Replace the future flag for multiple policies IV

Removing future and using unlisted and cloud_only for the following
policy:
AssistantOnboardingMode

BYPASS_POLICY_COMPATIBILITY_CHECK=AssistantOnboardingMode is a launched
policy with future tag.

Bug: 1117637
Change-Id: Idf964a9e6bc661c4fd4d7e0eada34d847d9b286d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488043
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Felipe Andrade <fsandrade@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825472}

components/policy/resources/policy_templates.json

@@ -19882,10 +19882,11 @@
       ],
       'supported_on': ['chrome_os:85-'],
       'tags': [],
-      'future': True,
       'features': {
         'dynamic_refresh': False,
         'per_profile': True,
+        'unlisted': True,
+        'cloud_only': True,
       },
       'example_value': 'Default',
       'default': 'Default',