[CWS] add kmt test run with just `TestEventMonitor` #77651

Job	Run time
release-note-check	1m 12s
assign-team-label	51s
agenttelemetry-list-change-ack-check	50s
ask-reviews	0s
fetch-labels	1s
skip-qa-check	27s
team-label-check	1s
	3m 22s

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