HYPERFLEET-1196 - chore: add sherine-k to OWNERS

[rafabene]

Summary

• Add sherine-k to OWNERS files (approvers and reviewers)
• New team member onboarding for Prow-based code review workflows

Related

• HYPERFLEET-1196

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rafabene

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Details

Needs approval from an approver in each of these files:

• ci-operator/step-registry/hyperfleet/OWNERS [rafabene]
• ci-operator/step-registry/openshift-hyperfleet/OWNERS [rafabene]

Approvers can indicate their approval by writing /approve in a comment
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[openshift-merge-bot]

[REHEARSALNOTIFIER]
@rafabene: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

[openshift-ci]

@rafabene: all tests passed!

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