ROX-13666: Split dbclient.EnsureDBProvisioned() into two functions

[vladbologa]

Description

The EnsureDBProvisioned() was doing two things:

• ensures that the DB was provisioned
• obtains and returns the data necessary to connect to the DB (host name, etc)

It should be possible to do these things independently of each other, and this PR addresses that.

This will be needed in a follow-up PR, to use non-privileged Postgres users for ACS instances.

Checklist (Definition of Done)

• Unit and integration tests added
• Added test description under Test manual
• Evaluated and added CHANGELOG.md entry if required
• Documentation added if necessary (i.e. changes to dev setup, test execution, ...)
• CI and all relevant tests are passing
• Add the ticket number to the PR title if available, i.e. ROX-12345: ...
• Discussed security and business related topics privately. Will move any security and business related topics that arise to private communication channel.

Test manual

Tested locally by verifying that a DB was provisioned, and that the Central was able to connect:
INSTALL_OPERATOR=NO MANAGED_DB_ENABLED=TRUE ./dev/env/scripts/up.sh
./scripts/create-central.sh

To test locally, I have to make the DB publicly accessible. I added a new VPC, security group and DB subnet group in dev on AWS for this purpose.

# To run tests locally run:
make db/teardown db/setup db/migrate
make ocm/setup OCM_OFFLINE_TOKEN=<ocm-offline-token> OCM_ENV=development
make verify lint binary test test/integration

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kovayur, SimonBaeumer, vladbologa

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [SimonBaeumer,kovayur,vladbologa]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment