fix: move vite plugins into the packages that use them (#16134)

I was looking into [Dependabot Alert
107](https://github.com/twentyhq/twenty/security/dependabot/107) and
figured that the alert is caused by `vite-plugin-dts`, which is a
development dependency and does not make it into the production build
for it to be dangerous.

However, while at it, I also saw that some packages used plugins from
root package.json while others had them defined in their local
package.json. Therefore, I refactored to move plugins where they're
required and removed a redundant package.

Builds for the following succeed as intended:
- twenty-ui
- twenty-emails
- twenty-website
- twenty-front

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

package.json

@@ -187,11 +187,7 @@
     "ts-node": "10.9.1",
     "tsconfig-paths": "^4.2.0",
     "tsx": "^4.17.0",
-    "vite": "^7.0.0",
-    "vite-plugin-checker": "^0.10.2",
-    "vite-plugin-cjs-interop": "^2.2.0",
-    "vite-plugin-dts": "3.8.1",
-    "vite-plugin-svgr": "^4.2.0"
+    "vite": "^7.0.0"
   },
   "engines": {
     "node": "^24.5.0",