chore(spanner): extract ErrorDetails from grpc-status-details-bin for raw gRPC exceptions #21358

Job	Run time
bulk-filter	1m 9s
units (8)	44s
lint	3m 5s
gapic-libraries-bom	14m 36s
changes	28s
windows	2m 38s
units (25)	30s
enforcer	20m 12s
units (21)	30s
units (11)	32s
generation-config-check	1m 11s
units (17)	31s
split-dependencies (java-spanner)	3m 34s
split-clirr (java-spanner)	2m 53s
split-units (java-spanner, 8)	5m 11s
split-units (java-spanner, 25)	4m 56s
split-units (java-spanner, 21)	4m 35s
split-units (java-spanner, 17)	4m 40s
split-units (java-spanner, 11)	4m 29s
conditional-required-check	3s
	1h 16m 27s

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