Add getSignalsForGracefulWorkerShutdown() to QueueConfig

[Chemaclass]

📖 Description

The harness is already doing an override (getQueueProcessTimeout()) to add the process timeout to fix issues with queues not completing during app install. The method getSignalsForGracefulWorkerShutdown() was introduced in Spryker 2021.08, but it's not in the workspace harness yet.

[andytson-inviqa]

there's a codesniff issue on the change:

> APPLICATION_ENV=development vendor/bin/console code:sniff:style
Store: DE | Environment: development
Run Code Style Sniffer for PROJECT
FILE: /app/src/Pyz/Zed/Queue/QueueConfig.php
----------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
----------------------------------------------------------------------
 30 | ERROR | Invalid typehint `list<int>`
----------------------------------------------------------------------
FILE: ...p/.my127ws/application/overlay/src/Pyz/Zed/Queue/QueueConfig.php
----------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
----------------------------------------------------------------------
 30 | ERROR | Invalid typehint `list<int>`
----------------------------------------------------------------------