extension: Temporarily remove the old vsce package

As that package was renamed to @vscode/vsce since the hereby removed
version of it. Prepare the ground for replacing it accordingly.

Signed-off-by: Marco Miller <marco.miller@ericsson.com>

Author: marco-miller

package.json

@@ -77,7 +77,6 @@
         "prettier": "2.8.8",
         "ts-loader": "^9.4.2",
         "typescript": "^5.0.4",
-        "vsce": "^2.15.0",
         "webpack": "^5.81.0",
         "webpack-cli": "^5.0.2"
     }