Upgrade to operator-sdk 1.41.1

[dprince]

Rescaffold the nova-operator to operator-sdk 1.41.1, which includes:

• Reorganize project structure (pkg/ -> internal/)
• Move webhook implementations to internal/webhook/v1beta1/
• Add new cmd/main.go entrypoint with updated controller initialization
• Update RBAC, certmanager, and prometheus configurations
• Enhance network policies for metrics and webhook traffic
• Remove auto-generated test suite scaffolding
• Update build workflow and Dockerfile to version 1.41.1

This upgrade modernizes the operator structure and aligns with the latest operator-sdk best practices.

Jira: OSPRH-21969

Depends-On: openstack-k8s-operators/openstack-operator#1683

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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
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/9a74a948246442dfb17dea450b4c74a2

❌ openstack-meta-content-provider FAILURE in 11m 42s
⚠️ nova-operator-kuttl SKIPPED Skipped due to failed job openstack-meta-content-provider
⚠️ nova-operator-tempest-multinode SKIPPED Skipped due to failed job openstack-meta-content-provider
⚠️ nova-operator-tempest-multinode-ceph SKIPPED Skipped due to failed job openstack-meta-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
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/b77ba055c14a4fb896e67692835bbe63

❌ openstack-meta-content-provider FAILURE in 16m 35s
⚠️ nova-operator-kuttl SKIPPED Skipped due to failed job openstack-meta-content-provider
⚠️ nova-operator-tempest-multinode SKIPPED Skipped due to failed job openstack-meta-content-provider
⚠️ nova-operator-tempest-multinode-ceph SKIPPED Skipped due to failed job openstack-meta-content-provider