Fix message sync (#16186)

Follow up
https://twenty-v7.sentry.io/issues/7072565676/events/2068bcd0b5b642dca1215b015ac74cfd/?environment=prod&environment=prod-eu&project=4507072499810304&query=is%3Aunresolved%20%21issue.type%3A%5Bperformance_consecutive_db_queries%2Cperformance_consecutive_http%2Cperformance_file_io_main_thread%2Cperformance_db_main_thread%2Cperformance_n_plus_one_db_queries%2Cperformance_n_plus_one_api_calls%2Cperformance_p95_endpoint_regression%2Cperformance_slow_db_query%2Cperformance_render_blocking_asset_span%2Cperformance_uncompressed_assets%2Cperformance_http_overhead%2Cperformance_large_http_payload%5D%20timesSeen%3A%3E10&referrer=previous-event&sort=date
and
https://github.com/twentyhq/twenty/pull/16144/files#diff-3adef01a601936cd060128fd08874cf5938d477bfde39f306aa5070a068e07aa

packages/twenty-server/src/modules/messaging/message-import-manager/drivers/imap/providers/imap-client.provider.ts

@@ -6,10 +6,7 @@ import { CustomError, isDefined } from 'twenty-shared/utils';
 
 import { type ImapSmtpCaldavParams } from 'src/engine/core-modules/imap-smtp-caldav-connection/types/imap-smtp-caldav-connection.type';
 import { type ConnectedAccountWorkspaceEntity } from 'src/modules/connected-account/standard-objects/connected-account.workspace-entity';
-import {
-  MessageImportDriverException,
-  MessageImportDriverExceptionCode,
-} from 'src/modules/messaging/message-import-manager/drivers/exceptions/message-import-driver.exception';
+import { MessageImportDriverExceptionCode } from 'src/modules/messaging/message-import-manager/drivers/exceptions/message-import-driver.exception';
 
 type ConnectedAccountIdentifier = Pick<
   ConnectedAccountWorkspaceEntity,
@@ -86,13 +83,6 @@ export class ImapClientProvider {
     let client: ImapFlow | null = null;
     let timeoutId: NodeJS.Timeout | null = null;
 
-    if (!isDefined(connectionParameters.IMAP?.username)) {
-      throw new MessageImportDriverException(
-        'Username is required',
-        MessageImportDriverExceptionCode.CHANNEL_MISCONFIGURED,
-      );
-    }
-
     if (!isDefined(connectedAccount.handle)) {
       throw new CustomError(
         'Handle is required',