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feat(subsequences): background polling for async Google translations DEV-2090 (#7217)

### 📣 Summary
This PR enables background polling support for asynchronous automated
Google Translate operations.

### 📖 Description
Enables `allow_async=True` on `AutomaticGoogleTranslationAction`, so
long-running translation batch jobs now reuse the same
`poll_run_external_process` Celery task already used for automatic
transcription, instead of relying on the user to manually re-request the
translation after a timeout.

`GoogleTranslationService` now returns status: `in_progress` (instead of
status: `failed` with the `SYNC_RETRY_LATER_ERROR` message) whenever the
batch translation job is still running or a transient Google
infrastructure error occurs while starting/polling it. The Google
operation reference is preserved in these cases so the next poll resumes
the same job rather than starting a duplicate one.

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