nader-ziada: dont use hard-coded value for manager namespace

JobBuild
1209
03-04 22:17
pull-cluster-api-provider-azure-apidiff 1368929670724063232 1367663154129014784 1367600091124207616
pull-cluster-api-provider-azure-build 1368929670589845504 1367600090956435456
pull-cluster-api-provider-azure-coverage 1368929670753423360 1367600091157762048
pull-cluster-api-provider-azure-e2e 1368929670623399936 1367663154057711616 1367600090998378496
pull-cluster-api-provider-azure-e2e-windows 1368929670665342976 1367663154099654656 1367600091040321536
pull-cluster-api-provider-azure-test 1368929670560485376 1367600090922881024
pull-cluster-api-provider-azure-verify 1368929670690508800 1367600091094847488