Update `MaxRAMPercentage` to 70 #735

Job	Run time
integration (integration test, .ci/tests/integration/e2e.yaml)	10m 18s
integration (integration test, .ci/tests/integration/e2e.yaml)	16m 8s
integration (integration test, .ci/tests/integration/e2e.yaml)	16m 8s
integration (integration test, .ci/tests/integration/e2e.yaml)	40m 14s
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	10m 35s
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	16m 2s
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	16m 2s
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	30m 6s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	10m 36s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	15m 47s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	30m 52s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	30m 52s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	10m 35s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	16m 2s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	16m 2s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	23m 29s
	5h 9m 48s

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