Add `ProcessGuarantee` to WindowConfig #724

Job	Run time
integration (integration test, .ci/tests/integration/e2e.yaml)	39m 54s
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	36m 18s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	29m 55s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	31m 38s
	2h 17m 45s

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