chore: remove old link scripts (#28886)

This script was used to aid in the test of local version of
`@ionic/angular`. However, these instructions have been replaced by the
instructions in `packages/angular/test/README.md`. This PR removes the
old script.

Author: liamdebeasi

packages/angular/package.json

@@ -26,7 +26,6 @@
   "scripts": {
     "build": "npm run clean && npm run build.ng && npm run build.core && npm run clean-generated",
     "build.core": "node scripts/build-core.js",
-    "build.link": "npm run build && node scripts/link-copy.js",
     "build.ng": "ng-packagr -p ng-package.json -c tsconfig.json",
     "build.watch": "npm run build.ng -- --watch",
     "clean": "node scripts/clean.js",