fix: move PR template to correct location for auto-loading

[Copilot]

What this PR does / why we need it:

Template was at .github/PULL_REQUEST_TEMPLATE/pull_request_template.md. GitHub only auto-populates PR bodies from .github/pull_request_template.md — the subdirectory variant requires an explicit ?template= query param and is never applied automatically. Moves the file to the correct path.

Special notes for your reviewer:

Single file rename + trailing period fix on one checklist item.

If you are promoting an image, please make sure you have done the following:

• I have verified the digest with gcrane and added it as a comment to the PR or in the body.

• I'm promoting a multi-arch image that matches all the supported platforms of Kubernetes.

• I'm not promoting a tag that resolves to latest or moving tags as these are not supported.

• registry.k8s.io is an immutable registry and I'll need to cut a new release if the digest is wrong.

[k8s-ci-robot]

Hi @Copilot. Thanks for your PR.

I'm waiting for a kubernetes 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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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.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Copilot
Once this PR has been reviewed and has the lgtm label, please ask for approval from upodroid. For more information see the Code Review Process.

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• OWNERS

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[k8s-ci-robot]

PR needs rebase.

Details

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.