chore: add user details to aibridge interception list endpoint (#20397)

- Adds FK from `aibridge_interceptions.initiator_id` to `users.id`
- This is enforced by deleting any rows that don't have any users. Since
this is an experimental feature AND coder never deletes user rows I
think this is acceptable.
- Adds `name` as a property on `codersdk.MinimalUser`
- This matches the `visible_users` view in the database. I'm unsure why
`name` wasn't already included given that `username` is.
- Adds a new `initiator` field to `codersdk.AIBridgeInterception` which
contains `codersdk.MinimalUser` (ID, username, name, avatar URL)
- Removes `initiator_id` from `codersdk.AIBridgeInterception`
    - Should be fine since we're still in early access

coderd/database/queries/aibridge.sql

@@ -111,9 +111,12 @@ WHERE
 
 -- name: ListAIBridgeInterceptions :many
 SELECT
-	*
+	sqlc.embed(aibridge_interceptions),
+	sqlc.embed(visible_users)
 FROM
 	aibridge_interceptions
+JOIN
+	visible_users ON visible_users.id = aibridge_interceptions.initiator_id
 WHERE
 	-- Filter by time frame
 	CASE