remove firsttris.vscode-jest-runner extension

.devcontainer/devcontainer.json

@@ -19,7 +19,6 @@
     "eamodio.gitlens",
     "github.vscode-pull-request-github",
     "cschleiden.vscode-github-actions",
-    "firsttris.vscode-jest-runner",
     "msjsdiag.debugger-for-chrome",
     "firefox-devtools.vscode-firefox-debug",
     "editorconfig.editorconfig",