webrtc-load-tester: Migrate from Cloud Run to Compute Engine #744

Job	Run time
Build binaries for linux-arm64	1m 49s
Build binaries for linux-amd64	50s
Build binaries for windows-arm64	1m 58s
Build binaries for windows-amd64	2m 18s
Build binaries for darwin-arm64	3m 7s
Build binaries for darwin-amd64	2m 4s
Upload lapi to google bucket	26s
Upload loadtester to google bucket	33s
Upload mapi to google bucket	32s
Upload recordtester to google bucket	45s
Upload streamtester to google bucket	47s
Upload testdriver to google bucket	33s
	15m 42s

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