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test: regression test for ctx propagation in mountBlobfuseWithProxy

Adds TestMountBlobfuseWithProxy_ContextCancellation which spins up a
fake blobfuse-proxy gRPC server whose MountAzureBlob blocks until the
request context is cancelled. The test then calls
mountBlobfuseWithProxy with a cancellable parent context and cancels it
once the server has received the call.

With the fix in place the call returns promptly with a Canceled error.
Without the fix (the previous code passed context.TODO() to
MountAzureBlob), the call hangs and the test times out.