Make builds of TS-declarations more deterministic (#7248)

The cause for this was unknown, and was fixed by using "fork-ts-checker-webpack-plugin" instead of
"ts-loader".

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>
Co-authored-by: Iku-turso <mikko.aspiala@gmail.com>

packages/infrastructure/webpack/package.json

@@ -25,6 +25,7 @@
   "dependencies": {
     "@types/webpack-env": "^1.18.0",
     "css-loader": "^6.7.2",
+    "fork-ts-checker-webpack-plugin": "^7.3.0",
     "mini-css-extract-plugin": "^2.7.0",
     "sass-loader": "^13.2.0",
     "style-loader": "^3.3.1",