Move more dns provider related code into the shared DomainsModel.js to avoid duplication

dashboard/src/components/DomainDialog.vue

@@ -21,30 +21,7 @@ const tlsProvider = ref('letsencrypt-prod-wildcard');
 const showAdvanced = ref(false);
 const customNameservers = ref(false);
 
-// we have to define all properties here which are used in the DomainProviderForm to keep reactivity alive
-const dnsConfig = ref({
-  accessKeyId: '',
-  accessKey: '',
-  accessToken: '',
-  apiKey: '',
-  apikey: '',
-  appSecret: '',
-  apiPassword: '',
-  apiSecret: '',
-  consumerKey: '',
-  credentials: { client_email: '', private_key: '' },
-  customerNumber: '',
-  defaultProxyStatus: false,
-  email: '',
-  endpoint: '',
-  password: '',
-  projectId: '',
-  secretAccessKey: '',
-  secretapikey: '',
-  token: '',
-  tokenType: '',
-  username: '',
-});
+const dnsConfig = ref(DomainsModel.createEmptyConfig());
 
 const isFormValid = ref(false);
 function checkValidity() {