chore: Remove unused keycloakdb service from docker-compose #6882

Job	Run time
benchmark tests	4m 22s
go (examples)	54s
go (sdk)	1m 57s
image build	1m 45s
go (service)	3m 1s
integration tests	5m 1s
go (lib/ocrypto)	50s
go (lib/fixtures)	34s
go (lib/flattening)	50s
license check	56s
Protocol Buffer Lint and Gencode Up-to-date check	21s
otdfctl e2e tests	5m 3s
platform-xtest / cross-client-test	9m 12s
ci	1s
	34m 47s

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