Timeout when deleting big projects or nodes

## Gentics Mesh Version, operating system, or hardware.
- v1.8.2

## Operating System
- Linux

## Problem

There is a project with too many versioned nodes inside (200 x nodes with 15k versions). This project or its nodes are not able to be deleted. Operation puts the cms instance into a deadlock and makes its API unresponsive.

## Reproducer

trying to delete nodes or project reproduces the problem.

## Expected behaviour and actual behaviour

Start by reproducing the deletion of a project or node containing many versioned nodes on Linux with Gentics Mesh v1.8.2. Trace the deletion path and observe where the CMS instance becomes unresponsive or deadlocks. Done means large project and node deletions complete without deadlocking or making the API unresponsive.

Written by the indexing model from the issue text.