One more fix for missing Activity embedding allowlisting for Assistant.

The normal settings fragments are already allowlisted via SubSettingActivity.
ManageApplications fragment based activities are not compatible with that however.

ManageApplications internally launches Spa activity, so that needs to be allowlisted as well.

For more context, see
go/conversational-care-activity-embedding-allowlisting

BUG: 282921726

Change-Id: I4765bd6ba8006a56bc8b7016f57dac2188a14592