Icu 6153 unknown credential support (#1344)

* feat: 🎸 Add support for unknown credential types

✅ Closes: ICU-6153

* fix: 🐛 add unknown cred type

* refactor: 💡 move credential type logic to a component

* chore: 🤖 fix component name

* fix: 🐛 update component name, remove unused translated string

* fix: 🐛 file name

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

addons/api/addon/models/credential-library.js

@@ -7,4 +7,27 @@ export const options = {
   http_method: ['GET', 'POST'],
 };
 
-export default class CredentialLibraryModel extends GeneratedCredentialLibraryModel {}
+/**
+ * Supported Credential Library types.
+ */
+export const types = ['vault'];
+
+export default class CredentialLibraryModel extends GeneratedCredentialLibraryModel {
+  // =attributes
+
+  /**
+   * True if credential is an unknown type.
+   * @type {boolean}
+   */
+  get isUnknown() {
+    return !types.includes(this.type);
+  }
+
+  /**
+   * True if credential is a vault type.
+   * @type {boolean}
+   */
+  get isVault() {
+    return this.type === 'vault';
+  }
+}