feat: implement Copilot Context Pinning (Chat Breadcrumbs)#312294

Vivek492005 wants to merge 3 commits intomicrosoft:mainmicrosoft/vscode:mainfrom

Vivek492005:feature/chat-context-pinning-v2Vivek492005/VSCode-Contribution:feature/chat-context-pinning-v2Copy head branch name to clipboard