feat: remove files from package.json (#2990)

## Description

It is necessary to publish everything inside the folder for the example
to work properly, just like the other examples.
When applying the src/** filter, neither the rspack-entires folder nor
the rspack.config.ts file was published.

Author: Iru89

examples/flow-builder-typescript/package.json

@@ -38,12 +38,6 @@
     "source-map-loader": "^0.2.4",
     "unorm": "^1.6.0"
   },
-  "files": [
-    "doc/**",
-    "lib/**",
-    "src/**",
-    "README.md"
-  ],
   "engines": {
     "node": ">=20.0.0",
     "npm": ">=10.0.0"