Add default label for all new issues (#2986)

.github/ISSUE_TEMPLATE/bug-report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report to help us improve
 title: ''
-labels: ''
+labels: 'Triage Needed'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: ''
+labels: 'Triage Needed'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/other.md

@@ -2,7 +2,7 @@
 name: Other
 about: Ask a question or file a different type of issue
 title: ''
-labels: ''
+labels: 'Triage Needed'
 assignees: ''
 
 ---