Refactor getCredential function to support shorthand credential types: 'd' for Default, 'cs' for ClientSecret, and 'dc' for DeviceCode. Remove obsolete client-secret-login script.

src/azure.js

@@ -11,8 +11,10 @@ import { DefaultAzureCredential, ClientSecretCredential, DeviceCodeCredential }
 
 export async function getCredential(credentialType, options) {
   switch (credentialType) {
+    case "d":
     case "default":
       return new DefaultAzureCredential();
+    case "cs":
     case "clientSecret":
       if (!options.tenantId || !options.clientId || !options.clientSecret) {
         throw new Error("tenantId, clientId, and clientSecret are required for ClientSecretCredential");
@@ -22,6 +24,7 @@ export async function getCredential(credentialType, options) {
         options.clientId,
         options.clientSecret
       );
+    case "dc":
     case "deviceCode":
       if (!options.tenantId || !options.clientId) {
         throw new Error("tenantId and clientId are required for DeviceCodeCredential");