This commit adds a new operator, `ArmadaTestReleases`, and DAG,
`test_site` that invokes Helm tests corresponding to each deployed
release across all namespaces. The `ArmadaTestReleases` operator also
supports the ability to invoke Helm tests for a specific release using
the `release` parameter and remove test pods if the `cleanup` parameter
is set to `true`.
Depends-On: https://review.openstack.org/#/c/603235/
Change-Id: Ie2e92c347b670258a7d6f49bff2e1e840b72067a
96f9d8d4a5