Add ssh keepalive to tunnel to workspace #1586

Job	Run time
test-e2e-windows (build)	36s
test-e2e (build)	11m 25s
test-e2e-windows (ide)	1s
test-e2e (ide)	10m 54s
test-e2e-windows (ssh)	1s
test-e2e (integration)	10m 38s
test-e2e-windows (up-docker)	1s
test-e2e (machine)	9m 44s
test-e2e-windows (up-docker-build)	1s
test-e2e-windows (up-docker-compose)	1s
test-e2e (machineprovider)	11m 2s
test-e2e (provider)	9m 40s
test-e2e (proxyprovider)	10m 53s
test-e2e (ssh)	10m 26s
test-e2e (up)	13m 26s
test-e2e (up-docker)	11m 52s
test-e2e (up-podman)	10m 23s
test-e2e (up-docker-compose)	12m 19s
test-e2e (up-docker-build)	10m 53s
test-e2e (up-docker-compose-build)	11m 9s
test-e2e (context)	9m 47s
	2h 45m 12s

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