Remove deprecated intellicode extensions from devcontainer.json (#6519)

deprecation: Remove intellicode extensions from devcontainer.json.  Intellicode is deprecated by MS and the repo archived and read only since Nov 12, 2025.

Author: johnnypeck

{{cookiecutter.project_slug}}/.devcontainer/devcontainer.json

@@ -49,8 +49,6 @@
             "extensions": [
                 "davidanson.vscode-markdownlint",
                 "mrmlnc.vscode-duplicate",
-                "visualstudioexptteam.vscodeintellicode",
-                "visualstudioexptteam.intellicode-api-usage-examples",
                 // python
                 "ms-python.python",
                 "ms-python.vscode-pylance",