Update Eclipse Che APB

[ghost]

What does this PR do?

1. Add TLS support. Depending on user choice, secure or non secure routes are created. Also, Che server config map is edited accordingly
2. Add support of self signed certs. Content of a cert is provided by a user in the UI. Then the cert is saved to a secret and referenced in env for Che server and Keycloak. Entrypoints of both deployments act accordingly
3. Add support of using external Keycloak and/or Postgres. Since conditional textfields are not yet available (Add parsing of param dependencies openshift/ansible-service-broker#928) currently, I cannot hide fields and checkboxes depending on a user's choice. Can be improved with 3.11 out. Tested with external Keycloak/Red Hat SSO instance and a postgres provisioned in the same cluster in a dedicated namespace. For an external Keycloak, there are two modes: provision realm, client and user, or use an existing realm and client.
4. Remove unused tasks. There were a lot of unused tasks since the APB was built from existing Keycloak and Postgres APBs. Only tasks that are actually called are left. This makes APB yamls easier to read and understand.
5. Remove Keycloak IS - not sure I understand why this is the only deployment that uses it
6. Remove everything related to creating https route for Keycloak and then deleting it. Checking if Keycloak is available can be accomplished in a cleaner way.
7. Removed ifs with ephemeral plan id. Currently, it is not possible to deploy Che multiuser with H2 database.
8. Removed unnecessary Postgres deployment yamls from Keycloak APB - probably leftovers from the original independent Keycloak APB
9. Make Keycloak client id and realm really configurable (in json templates).