Validate openstack inputs and add input condition

[kstrenkova]

Test-operator needs both openstack-config and openstack-config-secret to run pods. However, there is no validation that they are mounted correctly. This PR adds a validation of those inputs and also adds InputReadyCondition, so status is correctly reported to the user.

[openshift-ci]

Skipping CI for Draft Pull Request.
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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kstrenkova

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/1deb46c4cc1b430d927dda9c9d8a333c

✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 34m 08s
❌ podified-multinode-edpm-deployment-crc-test-operator TIMED_OUT in 3h 16m 56s