CLI: Simplify summary message when using `--contract` #1000

Job	Run time
coverage	4m 58s
lint	1m 21s
tests (core)	1m 28s
tests (plugin-hardhat)	4m 58s
tests (plugin-truffle)	2m 27s
tests (plugin-defender-hardhat)	4m 57s
	20m 9s

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