Update .idea files

Change-Id: Idbaa23d81414417fbf1d8fadcad1d9eba3bf051f
diff --git a/.idea/.gitignore b/.idea/.gitignore
index 26d3352..8f00030 100644
--- a/.idea/.gitignore
+++ b/.idea/.gitignore
@@ -1,3 +1,5 @@
 # Default ignored files
 /shelf/
 /workspace.xml
+# GitHub Copilot persisted chat sessions
+/copilot/chatSessions