Better error messages from connection failures in MSAL (#22065)

* better error messages from connection failures in MSAL\, fix typo

* cleanup

* pr comments

* rename error interface

* address pr comments

* update api

* fix typings

* change one more typing

* fix build

* fix tests

src/sql/azdata.proposed.d.ts

@@ -432,18 +432,26 @@ declare module 'azdata' {
 		azurePortalEndpoint?: string;
 	}
 
-	export interface PromptFailedResult {
+	export interface PromptFailedResult extends ProviderError { }
+
+	export interface ProviderError {
 		/**
-		 * Error code used for non-user cancelled sign in errors
+		 * Error name
+		 */
+		name?: string;
+
+		/**
+		 * Error code
 		 */
 		errorCode?: string;
 
 		/**
-		 * Error message used for non-user cancelled sign in errors
+		 * Error message
 		 */
 		errorMessage?: string;
 	}
 
+
 	export namespace diagnostics {
 		/**
 		 * Represents a diagnostics provider of accounts.