feat(policy): 1500 Attribute create with Values (one RPC Call) should employ a db transaction #6731

Job	Run time
go (examples)	47s
go (sdk)	1m 52s
go (service)	2m 59s
Protocol Buffer Lint and Gencode Up-to-date check	23s
go (lib/ocrypto)	35s
image build	1m 38s
go (lib/fixtures)	41s
integration tests	4m 23s
go (lib/flattening)	44s
license check	49s
otdfctl e2e tests	4m 47s
platform-xtest / cross-client-test	8m 56s
ci	1s
	28m 35s

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