Remove the group call inspector

It's unused ever since we switched to LiveKit, and we intend to use other telemetry mechanisms going forward to fill this debugging use case, so it can be removed as discussed in today's team meeting.

package.json

@@ -60,16 +60,13 @@
     "lodash": "^4.17.21",
     "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#6385c9c0dab8fe67bd3a8992a4777f243fdd1b68",
     "matrix-widget-api": "^1.3.1",
-    "mermaid": "^9.0.0",
     "normalize.css": "^8.0.1",
     "pako": "^2.0.4",
     "postcss-preset-env": "^9.0.0",
     "posthog-js": "^1.29.0",
-    "re-resizable": "^6.9.0",
     "react": "18",
     "react-dom": "18",
     "react-i18next": "^13.0.0",
-    "react-json-view": "^1.21.3",
     "react-router-dom": "^5.2.0",
     "react-use-clipboard": "^1.0.7",
     "react-use-measure": "^2.1.1",