spanner: only retry certain types of internal errors. #2460
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Reference: https://github.com/googleapis/java-spanner/blob/f89da6a1f4f8a86c136a23dfd2f5b073dd65407a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/SpannerExceptionFactory.java#L257-L269
Fixes #2443