feat: add a global flag to enable/disable PauseRollout #865

Job	Run time
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	58m 33s
integration (integration test, .ci/tests/integration/e2e.yaml)	49m 51s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	40m 7s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	31m 49s
	3h 0m 20s

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