Query file generation doesn't know about `allow_user_specified_id`

[jackfischer]

If you attempt to assign to id := in an edgeql query file and generate TS off of it you hit

Error in file './queries/migration/InsertActivitySnapshotWithCustomId.edgeql': QueryError: cannot assign to property 'id'
   |
 2 |   id := <uuid>$snapshotId,
   |   ^^^^^^^^^^^^^^^^^^^^^^^
Hint: consider enabling the "allow_user_specified_id" configuration parameter to allow setting custom object ids

[scotttrinh]

Ahh, yes. I think this is adding evidence to a pattern that I'm already thinking about where you configure your gel client in something like a gel.config.ts file and the generators (and presumably your app) uses that client.