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[Python] Handle translated Azure missing-blob errors in exists - #40845
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BlobStorageIO.exists currently catches ResourceNotFoundError, but _blob_properties translates that exception into BlobStorageError. A missing blob therefore raises instead of returning False, causing FileBasedSink.pre_finalize / WriteToText to fail for a fresh Azure Blob destination.
Catch the translated BlobStorageError and check its code. Preserve failures for every non-404 response. Reuse the existing Azure filesystem and exception translation; no client, retry or pipeline changes.
Validation: the new missing-blob regression fails against the unmodified Beam 2.72 SDK with BlobStorageError(None, 404). All eight tests in blobstorageio_test.py (four existing path cases and four existence cases) pass with the fix using Beam 2.72 and the Azure SDK. Coverage includes existing blobs, the real ResourceNotFoundError-to-BlobStorageError translation, authorization failures and non-404 translated failures. Full suites run in CI.
The failure was reproduced on Flink 1.20 using the Beam 2.72 portable Python SDK with Azure workload identity; no credentials are needed for the regression tests.