chore: Updated code owners

[Prekshith-Microsoft]

This pull request makes a small update to the repository's code ownership configuration. Two new owners are added to the default owners list in the .github/CODEOWNERS file.## Purpose

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Does this introduce a breaking change?

This pull request makes a small update to the repository's code ownership. Two new users have been added as default owners for all files.

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

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Other Information

This pull request updates the default code owners for the repository by replacing one owner and adding a new one. No functional code changes are included.

• Updated the default owners in .github/CODEOWNERS by replacing @Ragini-Microsoft with @toherman-msft and adding @nchandhi.