Pass repo manager to Donna (#25962)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Report a bug
 about: Create a report to help us improve
 labels: kind/bug, priority/P2
-assignees: karthikravis
+assignees: donnadionne
 
 ---
 

.github/ISSUE_TEMPLATE/cleanup_request.md

@@ -2,7 +2,7 @@
 name: Request a cleanup
 about: Suggest a cleanup in our repository
 labels: kind/internal cleanup, priority/P2
-assignees: karthikravis
+assignees: donnadionne
 
 ---
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Request a feature
 about: Suggest an idea for this project
 labels: kind/enhancement, priority/P2
-assignees: karthikravis
+assignees: donnadionne
 
 ---
 

.github/ISSUE_TEMPLATE/question.md

@@ -2,7 +2,7 @@
 name: Ask a question
 about: Ask a question
 labels: kind/question, priority/P3
-assignees: karthikravis
+assignees: donnadionne
 
 ---
 

.github/pull_request_template.md

@@ -8,4 +8,4 @@ If you know who should review your pull request, please remove the mentioning be
 
 -->
 
-@karthikravis
+@donnadionne