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>

ui/admin/app/routes/scopes/scope/credential-stores/credential-store/credentials/new.js

@@ -29,15 +29,23 @@ export default class ScopesScopeCredentialStoresCredentialStoreCredentialsNewRou
       'scopes.scope.credential-stores.credential-store'
     );
     let name, description;
+    /**
+     * this sets the credential attribute json_object to a string that
+     * replicates an empty json blob as CodeMirror expects a string
+     */
+    const json_object = '{}';
+
     if (this.currentModel?.isNew) {
       ({ name, description } = this.currentModel);
       this.currentModel.rollbackAttributes();
     }
+
     return this.store.createRecord('credential', {
       type,
       credential_store_id,
       name,
       description,
+      json_object,
     });
   }