Update GH issue template (#3710)

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -2,6 +2,10 @@ name: 🐛 Bug Report
 description: Create a report to help us reproduce and fix the bug
 
 body:
+- type: markdown
+  attributes:
+    value: >
+      <strong>PLEASE NOTE THAT THE TORCHAUDIO REPOSITORY IS NO LONGER ACTIVELY MONITORED.</strong> You will not likely get a response. For open discussions, visit https://discuss.pytorch.org/.
 - type: markdown
   attributes:
     value: >

.github/ISSUE_TEMPLATE/documentation.yml

@@ -2,6 +2,10 @@ name: 📚 Documentation
 description: Report an issue related to https://pytorch.org/audio/stable/index.html
 
 body:
+- type: markdown
+  attributes:
+    value: >
+      <strong>PLEASE NOTE THAT THE TORCHAUDIO REPOSITORY IS NO LONGER ACTIVELY MONITORED.</strong> You will not likely get a response. For open discussions, visit https://discuss.pytorch.org/.
 - type: textarea
   attributes:
     label: 📚 The doc issue

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -2,6 +2,10 @@ name: 🚀 Feature request
 description: Submit a proposal/request for a new torchaudio feature
 
 body:
+- type: markdown
+  attributes:
+    value: >
+      <strong>PLEASE NOTE THAT THE TORCHAUDIO REPOSITORY IS NO LONGER ACTIVELY MONITORED.</strong> You may not get a response. For open discussions, visit https://discuss.pytorch.org/.
 - type: textarea
   attributes:
     label: 🚀 The feature

.github/pull_request_template.md

+<strong>PLEASE NOTE THAT THE TORCHAUDIO REPOSITORY IS NO LONGER ACTIVELY MONITORED.</strong> You may not get a response. For open discussions, visit https://discuss.pytorch.org/.