[Identity] Getting rid of instanceof (Azure#14763)

* [Identity] Getting rid of instanceof

I had some isntances of `instanceof`, which is causing issues once @azure/msal-common gets updated, since @azure/msal-node hasn't been released with the latest version of @azure/msal-common.

I know that checking for `names` is the way to go, but I had forgotten to remove these before.

This will fix `rush update --full`.

* Update CHANGELOG.md

* CHANGELOG feedback

* more MSAL errors

sdk/identity/identity/src/msal/utils.ts

@@ -149,27 +149,33 @@ export class MsalBaseUtilities {
    * Handles MSAL errors.
    */
   protected handleError(scopes: string[], error: Error, getTokenOptions?: GetTokenOptions): Error {
-    if (error instanceof msalCommon.AuthError) {
-      switch (error.errorCode) {
+    if (
+      error.name === "AuthError" ||
+      error.name === "ClientAuthError" ||
+      error.name === "BrowserAuthError"
+    ) {
+      const msalError = error as msalCommon.AuthError;
+      switch (msalError.errorCode) {
         case "endpoints_resolution_error":
           this.logger.info(formatError(scopes, error.message));
           return new CredentialUnavailableError(error.message);
         case "consent_required":
         case "interaction_required":
         case "login_required":
           this.logger.info(
-            formatError(scopes, `Authentication returned errorCode ${error.errorCode}`)
+            formatError(scopes, `Authentication returned errorCode ${msalError.errorCode}`)
           );
           break;
         default:
           this.logger.info(formatError(scopes, `Failed to acquire token: ${error.message}`));
           break;
       }
     }
-    if (error instanceof msalCommon.ClientConfigurationError) {
-      return error;
-    }
-    if (error.name === "AbortError") {
+    if (
+      error.name === "ClientConfigurationError" ||
+      error.name === "BrowserConfigurationAuthError" ||
+      error.name === "AbortError"
+    ) {
       return error;
     }
     return new AuthenticationRequiredError(scopes, getTokenOptions, error.message);