chore: improve visz on 504: Error in partition - {"error": "Connection error while initiating partition request from unstructured_client", "message": "", "type": "partition_connection_error"}

[yuming-long]

504: Error in partition - {"error": "Connection error while initiating
partition request from unstructured_client", "message": "", "type": "partition_connection_error"}

change: "ReadError after 5 retries over 312.4s" instead of "message": ""

---

Note

Low Risk
Behavior only changes error formatting/raising when the backoff budget is exhausted; normal retry and success paths are unchanged.

Overview
Improves observability when retries exceed max_elapsed_time by rethrowing the original exception type with a message that includes the number of attempts and total elapsed time (sync and async backoff paths), while preserving the original exception via chaining.

Bumps the generated SDK version/user-agent from 0.43.2 to 0.43.3.

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[awalker4]

Oops sorry, didn't see this in time. The version bump also needs to go in gen.yaml. Then you can copy the last block in RELEASES.md and change the values, it doesn't matter what it says in there. We just need to touch RELEASES to trigger a build