Add support for IntelliJ authentication type in DurableTaskSchedulerConnectionString. Update tests to verify the new credential type.

Author: YunchuWang

azuremanaged/src/main/java/com/microsoft/durabletask/azuremanaged/DurableTaskSchedulerConnectionString.java

@@ -15,6 +15,7 @@
 import com.azure.identity.AzurePowerShellCredentialBuilder;
 import com.azure.identity.DefaultAzureCredentialBuilder;
 import com.azure.identity.EnvironmentCredentialBuilder;
+import com.azure.identity.IntelliJCredentialBuilder;
 import com.azure.identity.InteractiveBrowserCredentialBuilder;
 import com.azure.identity.ManagedIdentityCredentialBuilder;
 import com.azure.identity.VisualStudioCodeCredentialBuilder;
@@ -184,6 +185,8 @@ private static Map<String, String> parseConnectionString(String connectionString
                 return new AzurePowerShellCredentialBuilder().build();
             case "visualstudiocode":
                 return new VisualStudioCodeCredentialBuilder().build();
+            case "intellij":
+                return new IntelliJCredentialBuilder().build();
             case "interactivebrowser":
                 return new InteractiveBrowserCredentialBuilder().build();
             case "none":

azuremanaged/src/test/java/com/microsoft/durabletask/azuremanaged/DurableTaskSchedulerConnectionStringTest.java

@@ -264,4 +264,24 @@ public void getCredential_ReturnsInteractiveBrowserCredential() {
         // Verify the correct credential type is returned
         assertTrue(credential instanceof InteractiveBrowserCredential);
     }
+
+    @Test
+    @DisplayName("getCredential should return IntelliJCredential for IntelliJ authentication type")
+    public void getCredential_ReturnsIntelliJCredential() {
+        // Arrange
+        String connectionString = String.format(
+            "Endpoint=%s;Authentication=%s;TaskHub=%s",
+            "https://example.com", "IntelliJ", "myTaskHub");
+
+        // Act
+        DurableTaskSchedulerConnectionString result = 
+            new DurableTaskSchedulerConnectionString(connectionString);
+
+        // Assert
+        TokenCredential credential = result.getCredential();
+        assertNotNull(credential);
+        
+        // Verify the correct credential type is returned
+        assertTrue(credential instanceof IntelliJCredential);
+    }
 }