Add review guidance for deprecated components (#32620)
### Description
<!-- Describe your changes. -->
Add agent review guidance for deprecated components.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Instruct agent reviewer to direct PRs away from updating deprecated
components.
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
