CLI: Simplify summary message when using `--contract` (#905) #1005

Job	Run time
lint	1m 34s
tests (core)	1m 27s
coverage	12m 1s
tests (plugin-hardhat)	5m 42s
tests (plugin-truffle)	1m 56s
tests (plugin-defender-hardhat)	7m 8s
	29m 48s

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