Privitize all packages that are not ember-source, @glimmer/syntax, and @glimmer/component - #21556

❯ pnpm ls -r --depth -1 --json | jq '[.[] | select(.private != true and .name != "ember-source")]'

[
  {
    "name": "@glimmer/component",
    "version": "2.1.1",
    "path": "/Users/psego/Development/OpenSource/emberjs/ember.js-9/packages/@glimmer/component",
    "private": false
  },
  {
    "name": "@glimmer/syntax",
    "version": "0.95.0",
    "path": "/Users/psego/Development/OpenSource/emberjs/ember.js-9/packages/@glimmer/syntax",
    "private": false
  }
]