PR Summary

If we're re-running the release pipeline and the MSIX blob is already present from a previous run, remove it before reuploading. If we want to retain the existing MSIX then we can deselect the stage.

Currently this would throw due to Set-AzStorageBlobContent calling ShouldContinue when the blob exists. So if we wanted to actually replace the MSIX we'd need to manually delete the blob.

PR Context

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