Use fvm dart version to run builds

[ztefanie]

Currently the build runner and build tasks in the Intellij configs (and even when running the commands in the command line) are using the globally installed dart version. This is not very robust and leads to errors.

We should change the project run config stuff to use the fvm dart version not the globally installed one.

Maxs comment on this: "I think there was a reason to do it the other way around, but maybe only for CI. Not so sure sadly but worth trying! It makes way more sense!"

[ztefanie]

linux workaround script to downgrade dart:`

sudo apt remove dart -y && sudo rm -rf /usr/lib/dart && sudo rm -rf /usr/local/share/dart
sudo apt install dart=3.3.1-1 -y
dart pub global deactivate fvm && dart pub global deactivate protoc_plugin
dart pub global activate fvm && dart pub global activate protoc_plugin
dart --version