Secretless has e2e tests with Conjur OSS in Kubernetes

[izgeri]

We need to add automated end-to-end tests for Conjur OSS, but our e2e automation system is bloated and likely running many redundant tests.

Draft requirements (may be revised):

• Tests run in a realistic environment with. OSS as the source of truth for secret data
• Tests run in Kubernetes (helm chart doesn't currently support OC)
• Tests run against Conjur OSS latest image
• Tests run against PostgreSQL and MySQL as the Secretless target services
• Tests validate that a demo application is able to run as expected while making database connections via Secretless
• The test suite does not need to run with every PR of Secretless, but should run daily and we should be able to run it against a local build of the Secretless image to prep for a releas

[izgeri]

Note: these tests exist now in the https://github.com/cyberark/conjur-oss-suite-release repo