Resource-instance adv-search facet has misleading logic

[whatisgalen]

When your resource-instance node can reference multiple different instances (i.e. it's a resource-instance-list datatype), the advanced search lets you filter on specific references. See image:

If a user is searching for instances that refer to a set of instances, there's an implicit "AND", i.e. "I want resources that reference both A and B". However the way the search actually executes is an "OR", showing results that refer to either A or B or both.

This can be traced to the datatype-specific logic in ResourceInstanceDataType.append_search_filters() method here:

search_query = Terms(
    field="tiles.data.%s.resourceId.keyword" % (str(node.pk)),
    terms=value["val"],
 )

such that value["val"] is a list of resourceid strings for each "references" resource instance.

Suggested improvement:
We could rename the label "References" --> "References any of" and potentially create a new option for "References all of" to delineate the underlying "AND" vs "OR" choices.

This would save a user from creating an entirely new facet of the same node just to explicitly select the "AND"/"OR" in the UI (see image below)