Icu 6657 auth method model fragments refactor (#1507)

* refactor: 💡 Remove fragment usage for arrays in auth method
* chore: 🤖 Remove ember-data-model-fragments

✅ Closes: ICU-6657

addons/api/addon/models/auth-method.js

@@ -1,5 +1,4 @@
 import GeneratedAuthMethodModel from '../generated/models/auth-method';
-import { fragmentArray } from 'ember-data-model-fragments/attributes';
 import { equal } from '@ember/object/computed';
 
 /**
@@ -29,36 +28,6 @@ export const options = {
 export default class AuthMethodModel extends GeneratedAuthMethodModel {
   // =attributes
 
-  @fragmentArray('fragment-auth-method-attributes-account-claim-map', {
-    emptyArrayIfMissing: true,
-    isNestedAttribute: true,
-  })
-  account_claim_maps;
-
-  @fragmentArray('fragment-string', {
-    emptyArrayIfMissing: true,
-    isNestedAttribute: true,
-  })
-  claims_scopes;
-
-  @fragmentArray('fragment-string', {
-    emptyArrayIfMissing: true,
-    isNestedAttribute: true,
-  })
-  signing_algorithms;
-
-  @fragmentArray('fragment-string', {
-    emptyArrayIfMissing: true,
-    isNestedAttribute: true,
-  })
-  allowed_audiences;
-
-  @fragmentArray('fragment-string', {
-    emptyArrayIfMissing: true,
-    isNestedAttribute: true,
-  })
-  idp_ca_certs;
-
   /**
    * @type {boolean}
    */