Move SearchFilter from @backstage/plugin-search to @backstage/plugin-search-react and deprecate it in @backstage/plugin-search, and also remove SearchFilterNext

Signed-off-by: Anders Näsman <andersn@spotify.com>

plugins/search-react/package.json

@@ -36,7 +36,8 @@
     "@backstage/version-bridge": "^1.0.1",
     "react-use": "^17.3.2",
     "@backstage/types": "^1.0.0",
-    "@material-ui/core": "^4.12.2"
+    "@material-ui/core": "^4.12.2",
+    "@material-ui/lab": "4.0.0-alpha.57"
   },
   "peerDependencies": {
     "@types/react": "^16.13.1 || ^17.0.0",
@@ -47,7 +48,8 @@
     "@backstage/test-utils": "^1.1.1-next.0",
     "@testing-library/react": "^12.1.3",
     "@testing-library/react-hooks": "^8.0.0",
-    "@testing-library/jest-dom": "^5.10.1"
+    "@testing-library/jest-dom": "^5.10.1",
+    "@testing-library/user-event": "^14.0.0"
   },
   "files": [
     "dist"