move Ensure Secret Pulled Images feature to beta

[stlaz]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR moves the Ensure Secret Pulled Images feature to enabled-by-default Beta.

Which issue(s) this PR is related to:

KEP: kubernetes/enhancements#2535

Special notes for your reviewer:

This is the list of PRs that need to merge first:

• kubelet: add metrics for EnsureImageExists #132644 - metrics
  • needs an approver
• kubelet: add metrics related to image pull records #132812 - metrics
  • needs an approver
• kubelet: invoke part of image verification policy earlier #133114 - bugfix
  • needs an approver
• Add E2E tests for Ensure Secret Pulled Images #134931 - e2e tests
• KEP-2535: move objects to beta, add storage version migration to filesystem cache #132579 - API version migration of on-disk stored records

Does this PR introduce a user-facing change?

The KubeletEnsureSecretPulledImages feature gate moves to Beta. It is now enabled by default.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

- [KEP]: https://github.com/kubernetes/enhancements/issues/2535

/cc @liggitt @enj @aramase @SergeyKanzhelev @haircommander

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: stlaz
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[stlaz]

/test pull-kubernetes-unit
all of the failures are unrelated, though it's quite suprprising to see this many
/test pull-kubernetes-unit-windows-master
unrelated failure in TestUpdateNewNodeStatus/5_image_limit

[k8s-ci-robot]

@stlaz: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-unit-windows-master	1f0f44d	link	false	/test pull-kubernetes-unit-windows-master

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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