Update Search service CODEOWNERS entries

[hizixin]

Copilot-Session: 36c38865-f7f6-4c27-94db-12e08cde6a94

Description

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

If an SDK is being regenerated based on a new API spec, a link to the pull request containing these API spec changes should be included above.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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[Copilot]

Pull request overview

Updates ownership routing for Azure Search code.

Changes:

• Removes the azsdk-search team from Search code ownership.
• Updates Search service owners.