[cassandra] Remove legacy driver from classpath #2620

Job	Run time
CLI End to End tests	10m 6s
Unit tests (Runtime)	8m 8s
End to End tests (Python, python)	23m 23s
Unit tests (Runtime IT)	20m 21s
End to End tests (Other, other)	23m 43s
Unit tests (Deployer)	11m 14s
Unit tests (Api Gateway)	7m 11s
Unit tests (Control plane)	8m 58s
Unit tests (Other)	13m 9s
Unit tests (Style)	7m 3s
	2h 13m 16s

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