Simpler cqlsh installation in base-admin-tools image #1125

Job	Run time
build-docker-image / build-image	3m 15s
feature-tests-ts / test	2m 3s
feature-tests-java / test	1m 55s
feature-tests-dotnet / test	1m 6s
feature-tests-go / test	2m 27s
feature-tests-python / test	1m 32s
	12m 18s

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