Fix KUBERNETES_MIN_VERSION propagation to operand workloads

[eXist-FraGGer]

Fixes #2233

Proposed Changes

• Add a common reconciler transformer that propagates KUBERNETES_MIN_VERSION from operator env to managed workloads.
• Inject/override KUBERNETES_MIN_VERSION for containers and initContainers in Deployment, StatefulSet, DaemonSet, and Job resources.
• Wire the transformer into the shared transform pipeline and add unit tests for both injection and no-op behavior when the env var is unset.

Release Note

Fixes a regression where `KUBERNETES_MIN_VERSION` configured for the operator was not propagated to Knative Serving/Eventing workloads managed by the operator.

Verification

• go test ./pkg/reconciler/common -count=1 passed.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: eXist-FraGGer / name: Ivan Sarokin (389f5a2)

[knative-prow]

Welcome @eXist-FraGGer! It looks like this is your first PR to knative/operator 🎉

[knative-prow]

Hi @eXist-FraGGer. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[knative-prow]

@eXist-FraGGer: 0 warnings.

Details

In response to this:

Fixes #2233

Proposed Changes

• Add a common reconciler transformer that propagates KUBERNETES_MIN_VERSION from operator env to managed workloads.
• Inject/override KUBERNETES_MIN_VERSION for containers and initContainers in Deployment, StatefulSet, DaemonSet, and Job resources.
• Wire the transformer into the shared transform pipeline and add unit tests for both injection and no-op behavior when the env var is unset.

Release Note

Fixes a regression where `KUBERNETES_MIN_VERSION` configured for the operator was not propagated to Knative Serving/Eventing workloads managed by the operator.

Verification

• go test ./pkg/reconciler/common -count=1 passed.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: eXist-FraGGer
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