Update CODEOWNERS (Azure#20366)

Author: mccoyp

.github/CODEOWNERS

@@ -41,7 +41,7 @@
 /sdk/communication/                                                  @acsdevx-msft
 
 # PRLabel: %KeyVault
-/sdk/keyvault/                                                       @schaabs @chlowell @mccoyp
+/sdk/keyvault/                                                       @schaabs @chlowell @mccoyp @YalinLi0312
 
 # PRLabel: %Monitor - LogAnalytics
 /sdk/loganalytics/                                                   @alexeldeib
@@ -143,4 +143,4 @@
 
 # Add owners for notifications for specific pipelines
 /eng/pipelines/templates/jobs/tests-nightly-python.yml               @lmazuel @mccoyp
-/eng/pipelines/aggregate-reports.yml                                 @lmazuel @mccoyp
+/eng/pipelines/aggregate-reports.yml                                 @lmazuel @mccoyp @YalinLi0312