SPIKE Reg Search Doc Service

Code was added, but never released for saving the generated documents in GCP for search. Currently it regenerates the documents via legal-api every time a user requests it (this is the slowest call in the app).

Need to look at the doc service doug was implementing and see if we can integrate that. Chat with Thor before starting

Start by chatting with Thor, then review the document service Doug was implementing and the current legal-api regeneration flow. Determine how the generated documents should be saved in GCP and served for search; done means users no longer trigger regeneration on every request.

Written by the indexing model from the issue text.