Update `MaxRAMPercentage` to 70 #737

Job	Run time
integration (integration test, .ci/tests/integration/e2e.yaml)	11m 8s
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	11m 14s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	11m 5s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	11m 22s
	44m 49s

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