Split the UI and backend containers in their independent deployment.

[carlosthe19916]

Currently we deploy the UI and backend together in the same deployment. And we use the operator for continuous testing of both the UI and backend. The problem is that is backend's UI is always behind the ui repository, therefore testing the UI served by the backend means testing an outdated version of the UI.

The solution should be to keep both elements independent from each other and let each repository decide how often update their latest tag of their containers

Once that is done, this PR trustification/trustify-ci#3 should be reverted