Introduce common controller

[kstrenkova]

To remove duplicate code across the test-operator controllers, this patch introduces a common controller. This change should make fixing controller bugs easier and prepare the test-operator for new resource addition, if it is needed in the future.

Assisted-by: Claude AI

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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/adfde4fcd4304119bd34f1850e6865e3

❌ openstack-k8s-operators-content-provider FAILURE in 8m 07s
⚠️ podified-multinode-edpm-deployment-crc-test-operator SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider

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Build failed (check pipeline). Post recheck (without leading slash)
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/d88e72ae94b345839b13e9924a10f912

✔️ openstack-k8s-operators-content-provider SUCCESS in 27m 00s
❌ podified-multinode-edpm-deployment-crc-test-operator RETRY_LIMIT in 11m 45s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/500729983e5a4460b8eef76457b2d54f

❌ openstack-k8s-operators-content-provider FAILURE in 8m 28s
⚠️ podified-multinode-edpm-deployment-crc-test-operator SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider

[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/308dd766cd8e431ab9626de71046829a

✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 34m 29s
❌ podified-multinode-edpm-deployment-crc-test-operator TIMED_OUT in 3h 18m 25s

[kstrenkova]

Hi @stuggi 👋 I have this big change to create a common controller structure to reduce duplication in the controllers for different resource types. I wanted to ask if you could take a look at it logic-wise or if you know someone that could help me with reviewing this. I plan to do more local testing for different parts of the code, but as the check job passes I think the main logic should work, so I wanted to get some eyes on it now. Thank you in advance 🙏