Update bug report template with instructions to not include any sensitive information (opensearch-project#2119)

Signed-off-by: vikhy-aws <191836418+vikhy-aws@users.noreply.github.com>

Author: vikhy-aws

.github/ISSUE_TEMPLATE/bug_report.md

@@ -15,17 +15,24 @@ Steps to reproduce the behavior:
 2. Click on '....'
 3. Scroll down to '....'
 4. See error
+<!-- ⚠️ IMPORTANT: Make sure to redact any sensitive information -->
 
 **What is the expected behavior?**
 A clear and concise description of what you expected to happen.
+<!-- ⚠️ IMPORTANT: Make sure to redact any sensitive information -->
 
 **What is your host/environment?**
  - OS: [e.g. iOS]
  - Version [e.g. 22]
  - Plugins
+<!-- ⚠️ IMPORTANT: Exclude host/environment details don't have any sensitive information -->
 
 **Do you have any screenshots?**
 If applicable, add screenshots to help explain your problem.
+<!-- ⚠️ IMPORTANT: Ensure screenshots don't contain sensitive information -->
 
 **Do you have any additional context?**
 Add any other context about the problem.
+<!-- ⚠️ IMPORTANT: Exclude sensitive details -->
+
+**Note:** <span style="color:red">Remember to sanitize/redact any sensitive fields or values</span>