Feature/update internal workflows

[n0900]

Remove copy/paste redundancy and maintenance nightmare in github actions via reusable actions.
Actions are now configured using strategy matrices in json format

Depends on a-sit-plus/internal-workflows@modularTests / WIP

[n0900]

common-setup also manages caches effectively using the official setup-gradle action which can be configured. Current setup is it updates the cache automatically iff action is performed on main or development and Test Everything is triggered on push to either. Caches are never deleted - github purges the unused automatically when hitting the limit.

[n0900]

Caching would look like this
https://github.com/n0900/signum1/actions/caches

In the cloned repository the windows runner fails the reporting step but this cannot be reproduced in the main repository.

Also notice the nice cache reporting in
https://github.com/n0900/signum1/actions/runs/21143774314