refactor: 💡 convert brokered cred IDs array to simple attribute (#1259)

* refactor: 💡 convert brokered cred IDs array to simple attribute

* fix: 🐛 missing test assertion

* fix: 🐛 simplify computed

* refactor: 💡 convert host sources array to simple attribute (#1260)

* refactor: 💡 convert host source IDs array to simple attribute

* fix: 🐛 host source tests

* Refactor role fragment arrays (#1262)

* refactor: 💡 convert grant strings to regular attribute

* refactor: 💡 convert principals array to simple attribute

* Update ui/admin/app/routes/scopes/scope/roles/role.js

Co-authored-by: Zhihe Li <zhihe.li@hashicorp.com>

Co-authored-by: Zhihe Li <zhihe.li@hashicorp.com>

Co-authored-by: Zhihe Li <zhihe.li@hashicorp.com>

* fix: 🐛 remove unused import

Co-authored-by: Zhihe Li <zhihe.li@hashicorp.com>

addons/api/tests/unit/transforms/string-array-test.js

@@ -0,0 +1,28 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+
+module('Unit | Transform | string array', function (hooks) {
+  setupTest(hooks);
+
+  test('it deserializes an array of strings to an array of `{value}`', function (assert) {
+    assert.expect(1);
+    const transform = this.owner.lookup('transform:string-array');
+    const deserialized = transform.deserialize(['a', 'bee', 'Hello World']);
+    assert.deepEqual(deserialized, [
+      { value: 'a' },
+      { value: 'bee' },
+      { value: 'Hello World' },
+    ]);
+  });
+
+  test('it serializes an array of `{value}` to an array of strings', function (assert) {
+    assert.expect(1);
+    const transform = this.owner.lookup('transform:string-array');
+    const serialized = transform.serialize([
+      { value: 'a' },
+      { value: 'bee' },
+      { value: 'Hello World' },
+    ]);
+    assert.deepEqual(serialized, ['a', 'bee', 'Hello World']);
+  });
+});