flows: clear flow state before redirecting to final URL #27676

Job	Run time
lint-golint	47s
test-unittest	2m 6s
ci-outpost-mark	1s
build-container (proxy)	3m 0s
build-container (ldap)	2m 34s
build-binary (proxy, linux, amd64)	2m 19s
build-container (radius)	2m 34s
build-binary (proxy, linux, arm64)	1m 48s
build-container (rac)	2m 37s
build-binary (ldap, linux, amd64)	1m 56s
build-binary (ldap, linux, arm64)	1m 41s
build-binary (radius, linux, amd64)	1m 49s
build-binary (radius, linux, arm64)	1m 46s
build-binary (rac, linux, amd64)	1m 42s
build-binary (rac, linux, arm64)	1m 44s
	28m 24s

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