Add workflow for PowerShell clients (#21979) #1

Job	Run time
Build Java Client JDK11 (samples/client/echo_api/java/feign-gson)	1m 25s
Build Java Client JDK11 (samples/client/echo_api/java/resttemplate)	1m 18s
Build Java Client JDK11 (samples/client/echo_api/java/apache-httpclient)	1m 23s
Build Java Client JDK11 (samples/client/echo_api/java/native)	1m 25s
Build Java Client JDK11 (samples/client/echo_api/java/resteasy)	1m 2s
	6m 33s

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