Update CODEOWNERS for appconfiguration and ServiceOwners

[rossgrambo]

Removed @albertofori and @rossgrambo from appconfiguration owners and updated ServiceOwners.

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.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

Thank you for your contribution @rossgrambo! We will review the pull request and get back to you soon.

[rossgrambo]

@albertofori and @rossgrambo are no longer at Azure so they should be removed as owners here.

[rossgrambo]

cc @mrm9084 @jimmyca15

[Copilot]

Pull request overview

Updates repository ownership metadata for the App Configuration area by removing two individual owners and aligning the ServiceOwners list accordingly.

Changes:

• Removed @albertofori and @rossgrambo from the /sdk/appconfiguration/ CODEOWNERS entry.
• Updated the %App Configuration # ServiceOwners: list to match the new ownership set.