ci: remove @lerna-lite/exec #642

Job	Run time
matrix	8s
test (@browserless/benchmark)	3m 54s
test (browserless)	3m 59s
test (@browserless/cli)	3m 55s
test (@browserless/devices)	3m 55s
test (@browserless/errors)	4m 22s
test (@browserless/function)	4m 6s
test (@browserless/goto)	4m 20s
test (@browserless/lighthouse)	4m 9s
test (@browserless/pdf)	3m 59s
test (@browserless/screencast)	4m 21s
test (@browserless/screenshot)	3m 56s
test (@browserless/test)	1m 42s
finish	0s
	46m 46s

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