insights: migrate compute searches to the streaming endpoint

Created by: coury-clark

To fully migrate all of our Search integrations to a stream, we need to move the compute queries to their respective streaming endpoint.

Notebook for context https://sourcegraph.com/notebooks/Tm90ZWJvb2s6NjU5

Some thoughts:

1. Is the schema the same as the standard streaming API?
2. Are there any differences between the GraphQL and stream in terms of available response fields?