Ember 5 Compatibility Beta

Changelog:

• Only test jquery integration with Ember 3 (02fdc61)
• Fix more problems (2f92019)
• Add @ember/string for Ember 5.x (3375190)
• Fix typo (043630e)
• also fix @ember/polyfills assign usage (49f4271)
• Fixes removal of @ember/error in ember 5 (3663567)