Apply label automatically when issue creation from template (#15154)

.github/ISSUE_TEMPLATE/bug_report.md

 ---
 name: Bug Report
 about: If something isn't working as expected
-
+labels: bug
 ---
 
 <!-- Make sure that you are submitting a new bug that was not previously reported or already fixed -->

.github/ISSUE_TEMPLATE/feature_request.md

 ---
 name: Feature Request
 about: I have a suggestion
-
 ---
 
 <!-- Please use a concise and distinct title for the issue -->