test(spanner): return err from tx #2509
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A read/write transaction should always return any error to the transaction runner and let it determine whether it should be returned to the user application, or it should cause a transaction retry. Failing to do so, can cause the transaction to fail sometimes with an Aborted error. Fixes #2486
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A read/write transaction should always return any error to the transaction runner and let it determine whether it should be returned to the user application, or it should cause a transaction retry. Failing to do so, can cause the transaction to fail sometimes with an Aborted error.
Fixes #2486