build: remove ngcc post-install hook

Angular packages are now shipped in Ivy partial mode which makes running NGCC redundant.

(cherry picked from commit 1cc7d22)

Author: alan-agius4

package.json

@@ -26,10 +26,9 @@
     "lint": "eslint --cache --max-warnings=0 \"**/*.ts\"",
     "templates": "node ./bin/devkit-admin templates",
     "validate": "node ./bin/devkit-admin validate",
-    "postinstall": "yarn webdriver-update && yarn ngcc && yarn husky install",
+    "postinstall": "yarn webdriver-update && yarn husky install",
     "//webdriver-update-README": "ChromeDriver version must match Puppeteer Chromium version, see https://github.com/GoogleChrome/puppeteer/releases http://chromedriver.chromium.org/downloads",
     "webdriver-update": "webdriver-manager update --standalone false --gecko false --versions.chrome 92.0.4515.107",
-    "ngcc": "ngcc --properties es2015 browser module main --first-only --create-ivy-entry-points",
     "public-api:check": "node goldens/public-api/manage.js test",
     "public-api:update": "node goldens/public-api/manage.js accept",
     "ts-circular-deps:check": "ng-dev ts-circular-deps check --config ./packages/circular-deps-test.conf.js",