Modify metrics example to export via OTLP to telemetry.googleapis.com #801

Job	Run time
Test (root, java-11)	3m 22s
Test (examples/instrumentation-quickstart, java-11)	49s
Shadow Jar Build (Java 11)	2m 58s
Stylecheck (root)	1m 17s
Stylecheck (examples/instrumentation-quickstart)	1m 20s
	9m 46s

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