Fix windows not being able to build new Feature packages (#7220)

* Add missing dev script

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Inline all shared scripts to make them work in all environments

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using deterministic fake for path.join in unit test

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Make multi export config for webpack not fail when used in windows

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

---------

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

package-lock.json

@@ -32832,9 +32832,6 @@
         "jest-watch-typeahead": "^2.2.1",
         "lodash": "^4.17.21",
         "ts-jest": "^29.0.3"
-      },
-      "bin": {
-        "lens-test": "bin/test.sh"
       }
     },
     "packages/infrastructure/jest/node_modules/@jest/console": {
@@ -34112,10 +34109,6 @@
         "webpack": "^5.75.0",
         "webpack-cli": "^4.10.0",
         "webpack-node-externals": "^3.0.0"
-      },
-      "bin": {
-        "lens-build": "bin/build.sh",
-        "lens-remove-build": "bin/remove-build.sh"
       }
     },
     "packages/infrastructure/webpack/node_modules/sass-loader": {