chore(ci): Remove keytool step #7641

Job	Run time
benchmark tests	9m 53s
go (examples)	1m 8s
image build	2m 10s
go (sdk)	2m 1s
go (service)	3m 13s
integration tests	4m 51s
go (lib/ocrypto)	44s
otdfctl e2e tests	4m 25s
go (lib/fixtures)	53s
go (lib/flattening)	57s
Protocol Buffer Lint and Gencode Up-to-date check	21s
license check	2m 1s
platform-xtest / cross-client-test	12m 31s
ci	1s
	45m 9s

Provide feedback