feat: 🎸 create form for json credentials (#1498)

* feat: 🎸 create form for json credentials

✅ Closes: ICU-6682

* refactor: 💡 add new info field

* refactor: 💡 add feature flag

* refactor: 💡 add hds radio cards to json cred

* Update ui/admin/tests/acceptance/credential-store/credentials/create-test.js

* test: 💍 add test for json cred

* chore: 🤖 Remove ember-data-model-fragments package

* fix: 🐛 Update how json is added as a known credential type

* refactor: 💡 update credentialTypes if statement to ternary

* chore: 🤖 add ember-data back to addon/api project

* chore: 🤖 remove ember-feature-flag from addon/api

* refactor: 💡 remove if statement in cred form

* refactor: 💡 update selectors for json cred. tests

* refactor: 💡 Update Credential Form to use form.disabled

* test: 💍 Fix test selectors for radio card credential tests

* refactor: 💡 update credential types declaration to const

* style: 💄 Fix style issue with SecretEditor in edit mode

* refactor: 💡 remove disabled and readonly attributes in form

* refactor: 💡 Create credential ability canRead override

* test: 💍 add credential ability override tests

* test: 💍 Fix brokered credential test with json support added

* refactor: 💡 add attributes comment back to credential model

Co-authored-by: Cameron Perera <cameron.perera@hashicorp.com>

addons/api/addon/models/credential.js

@@ -3,7 +3,7 @@ import GeneratedCredentialModel from '../generated/models/credential';
 /**
  * Supported Credential types.
  */
-export const types = ['username_password', 'ssh_private_key'];
+export const types = ['username_password', 'ssh_private_key', 'json'];
 
 export default class CredentialModel extends GeneratedCredentialModel {
   // =attributes