Refactor test-operator volumes code

[kstrenkova]

Currently the test-operator volumes and volume mounts are written with a lot of duplicate code. This patch aims to remove that duplicity and make the code easier to understand.

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[softwarefactory-project-zuul]

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✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 47m 45s
❌ podified-multinode-edpm-deployment-crc-test-operator TIMED_OUT in 3h 11m 37s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 51m 18s
❌ podified-multinode-edpm-deployment-crc-test-operator FAILURE in 19m 20s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 29m 27s
❌ podified-multinode-edpm-deployment-crc-test-operator FAILURE in 2h 19m 30s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 22m 45s
❌ podified-multinode-edpm-deployment-crc-test-operator TIMED_OUT in 3h 13m 10s

[kstrenkova]

I have tested this change locally and it behaves the same as before refactor. All the volumes and volume mounts are created correctly, even the ones under if conditions.

[kstrenkova]

recheck

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Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 23m 51s
❌ podified-multinode-edpm-deployment-crc-test-operator TIMED_OUT in 3h 13m 40s

[kstrenkova]

recheck

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Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 22m 52s
❌ podified-multinode-edpm-deployment-crc-test-operator TIMED_OUT in 3h 13m 03s

[kstrenkova]

recheck

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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/3d4c17c9abd8421fa1997a712037fc1b

✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 23m 49s
❌ podified-multinode-edpm-deployment-crc-test-operator TIMED_OUT in 3h 13m 56s

[kstrenkova]

recheck

[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/650105745b934d5eae82d61ffd91f00f

✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 23m 32s
❌ podified-multinode-edpm-deployment-crc-test-operator TIMED_OUT in 3h 13m 23s

[openshift-merge-robot]

PR needs rebase.

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