Enables merging of user cloud policies into machine-level policies

Setting the policy to Enabled allows policies associated with a managed account to be merged into machine-level policies. Setting the policy to Disabled or leaving it unset prevents user-level cloud policies from being merged with policies from any other sources. Only policies originating from secure users can take precedence. A secure user is affiliated with the organization that manages their browser using Chrome Enterprise Core. All other user-level policies will have default precedence. Policies that need to be merged also need to be set in either PolicyListMultipleSourceMergeList or PolicyDictionaryMultipleSourceMergeList. This policy will be ignored if neither of the two aforementioned policies is configured.