build: add @babel/preset-env to dependencies (angular#37456)

`@babel/preset-env` is needed by for NGCC tests: https://github.com/angular/angular/blob/3569fdf45195c36713e43a91a4feba4fa3c9facf/packages/compiler-cli/ngcc/test/BUILD.bazel#L84

However this is not as a depedency in the angular repo.

PR Close angular#37456

Author: alan-agius4

package.json

@@ -50,6 +50,7 @@
     "@babel/cli": "^7.8.4",
     "@babel/core": "^7.8.6",
     "@babel/generator": "^7.8.6",
+    "@babel/preset-env": "^7.10.2",
     "@babel/template": "^7.8.6",
     "@babel/traverse": "^7.8.6",
     "@babel/types": "^7.8.6",