Add jhadvig to OWNERS

[jhadvig]

Summary

• Add jhadvig as approver and reviewer

Test plan

• OWNERS file syntax is valid

🤖 Generated with Claude Code

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[openshift-ci]

@jhadvig: all tests passed!

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Details

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