[Bug]: CY2024 PySide6 docker build on Rocky contains large volume of Qt debug files

### What happened?

I have successfully built the current main branch using the Rocky9 Docker workflow for both the CY2023 and CY2024 docker files (using the workaround described in #853 of building dependencies before main_executable).

The resulting tree in _build/stage/app that I've copied out of the docker container varies in size considerably and I think this is due to the Qt debug files that exist in the Qt6 version as opposed to the Qt5 build:

```
$ du -sh *
7.8G rv_3.0.0-c83f458-pyside6
5.2G rv_3.0.0-d69c055-pyside2
```

The PySide6 build has lots of debug files in its lib and plugins/Qt folders that the PySide2 version does not have (around 4GB worth of it). For example, lib/Qt6WebEngineCore.debug almost weighs 1 GB in of itself.

### List all the operating systems versions where this is happening

Rocky 9

### On what computer hardware is this happening?

quadcore AMD Ryzen 7 3750H

### Relevant console log output

```shell

```

### Environment variables

_No response_

### Extra information

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

Start with the Rocky 9 Docker workflow and compare the CY2023 and CY2024 Docker files, focusing on the staged tree under _build/stage/app and the Qt6 lib and plugins directories. Check the workaround described in #853 and determine how the debug files enter the PySide6 build; done means the CY2024 runtime image no longer contains unnecessary debug files and its size is reduced.

Written by the indexing model from the issue text.