[I] [BYO-S3] Frontend: AWS IAM-role warehouse form [texera]

["mengw15 (via GitHub)" <gi...@apache.org>]

mengw15 opened a new issue, #6936:
URL: https://github.com/apache/texera/issues/6936

   ### Task Summary
   
   Part of #6870. The UI for setting up an AWS (assume-role) warehouse.
   
   - **Local vs Cloud form** — the `user-warehouse` create form gains a Local/Cloud selector. The
     Cloud path calls `reserve-identity`, shows the platform principal ARN + the external ID for the
     user to paste into their IAM role's trust policy, and takes the resulting role ARN.
   - **Service wiring** — `warehouse.service.ts` gains the `reserveIdentity` call and surfaces
     `externalId` on `WarehouseInfo` so the UI can re-display it; shared helpers in `warehouse.util.ts`.
   
   ### Task Type
   - [x] Other (feature implementation)
   


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