supabase / supabase / 26087743383

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Surface errors from logs.all.otel endpoint (#46094)

## Context

If an error somehow occurs on the logs.all.otel endpoint for unified
logs, the network request still returns a 200 but the error is then
returned in the response as such:
<img width="681" height="269" alt="image"
src="https://github.com/user-attachments/assets/62bcf68f-8a8c-46a0-a91a-17f653004fa0"
/>

In which case, there's currently no UI error handling in unified logs,
and it'll just show no results. Changes in this PR addresses that:
<img width="1450" height="956" alt="image"
src="https://github.com/user-attachments/assets/1b2c166b-d3d1-4923-9e35-51bad99b6e1c"
/>


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## Summary by CodeRabbit

* **Bug Fixes**
* Enhanced error handling and messaging for log retrieval—displays
explicit error notifications when queries fail instead of misleading
empty state messages, improving user experience and clarity during
troubleshooting.

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