Increase timeout polling for secrets-encrypt metrics #2188

Job	Run time
build / Build	6m 33s
Integration Tests (certrotation)	2m 46s
Integration Tests (etcdrestore)	2m 41s
Integration Tests (localstorage)	2m 32s
Integration Tests (startup)	8m 56s
Integration Tests (custometcdargs)	1m 30s
Integration Tests (etcdsnapshot)	8m 52s
Integration Tests (kubeflags)	7m 59s
Integration Tests (longhorn)	3m 42s
Integration Tests (secretsencryption)	2m 59s
Integration Tests (flannelnone)	2m 12s
	50m 42s

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