Note to search open and closed issues when opening bug (#4057)

Since it's too easy to just search the open issues.

Author: andyleejordan

Diff for: .github/ISSUE_TEMPLATE/bug-report.yml

@@ -8,7 +8,7 @@ body:
     options:
     - label: I have written a descriptive issue title.
       required: true
-    - label: I have searched all [issues](https://github.com/PowerShell/vscode-powershell/issues?q=is%3Aissue) to ensure it has not already been reported.
+    - label: I have searched all [_open and closed_ issues](https://github.com/PowerShell/vscode-powershell/issues?q=is%3Aissue) to ensure it has not already been reported.
     - label: I have read the [troubleshooting](https://github.com/PowerShell/vscode-powershell/blob/main/docs/troubleshooting.md) guide.
     - label: I am sure this issue is with the _extension itself_ and does not reproduce in a standalone [PowerShell](https://github.com/PowerShell/PowerShell/issues/new/choose) instance.
     - label: I have verified that I am using the latest version of Visual Studio Code and the PowerShell extension.