Search export functionality broken in editable_future_graphs_feature_branch

[chrabyrd]

Filing this as a followup as it doesn't break main functionality.

As of editable_future_graphs_feature_branch, the search export interaction is broken. It does not result in a page break, but any resource instances that are out-of-date will not be exported. There are a couple of solutions available:

1. Have an additional file be included in the search export download, showing the resource_instances that didn't export and why
2. No longer delete cards/cards_x_nodes_x_widgets/nodes/nodegroups/edges from the database when a graph is updated. Then update the search_export command to handle for this. This functionality could also be expanded to the editor to allow users to edit instances even when the instance is not using the active graph.