Move database module content from lib-common to /api

[gibizer]

This is needed to resolve a circular dependency.

[gibizer]

/hold I need to test this

[gibizer]

/retest fixed cert manager issue

[openshift-ci]

@gibizer: The /retest command does not accept any targets.
The following commands are available to trigger required jobs:

• /test images
• /test mariadb-operator-build-deploy-kuttl
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Use /test all to run the following jobs that were automatically triggered:

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In response to this:

/retest fixed cert manager issue

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[gibizer]

/retest
cert manager issue is fixed

[gibizer]

/test mariadb-operator-build-deploy-kuttl

{  failed to wait for the created cluster claim to become ready: timed out waiting for the condition}

[gibizer]

/unhold
There are example adaptation PRs (nova, keystone) showing that this works

[fmount]

As per the conversation on slack, I think it's a good idea keeping the functions used for envTests aligned w/ the API, so we can see consistency between envTests execution and a job when we bump the api dependency that we include on a different operator.
+1 from me

[stuggi]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fmount, gibizer, stuggi

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