enable changing cnf suites timeout using env var #455

Job	Run time
qe-testing (accesscontrol)	30m 16s
qe-testing (affiliatedcertification)	11m 31s
qe-testing (manageability)	12m 11s
qe-testing (networking)	19m 25s
qe-testing (lifecycle)	30m 15s
qe-testing (performance)	12m 53s
qe-testing (platformalteration)	12m 37s
qe-testing (observability)	16m 17s
qe-testing (operator)	9m 21s
	2h 34m 46s

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