[MISC] Add MLE lead to config CODEOWNERS

[YouNeedCryDear]

Summary

• Add the MLE lead to the CODEOWNERS approval list for the config/ directory.

Reason

MLE will push all runtime and model related YAML changes into the config/ directory. Adding the MLE lead to the config approval list ensures those changes can be reviewed and approved by the right owner as they land.

Impact

• Config changes for runtime and model YAML updates can include the MLE lead in the required approval path.
• No runtime behavior changes are introduced.

Validation

• Confirmed the pushed branch misc/add-code-owner contains only the .github/CODEOWNERS update against main.
• No test run was needed for this CODEOWNERS-only metadata change.