Add `ProcessGuarantee` to WindowConfig #722

Job	Run time
integration (integration test, .ci/tests/integration/e2e.yaml)	1h 20m 12s
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	32m 5s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	27m 44s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	23m 53s
	2h 43m 54s

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