Add MCP Insiders Feedback issue template (#2280)

* Update issue templates

* Update insiders-feedback.md

Author: mattdholloway

.github/ISSUE_TEMPLATE/insiders-feedback.md

@@ -0,0 +1,14 @@
+---
+name: Insiders Feedback
+about: Give feedback related to a GitHub MCP Server Insiders feature
+title: "Insiders Feedback: "
+labels: ''
+assignees: ''
+
+---
+
+Version: Insiders
+
+Feature:
+
+Feedback: