In stead of having to repeat the command for every folder,
we can iterate over a list of them and execute the same
command over and over again.

This also fixes the SC2164 warning that was present.

In case it was not yet executable.
It makes it only executable on user level

Running the build_runner on every module.
This replaces the existing individual generation scripts.
Those modules without anything to generate will just output
"Could not find package `build_runner` or file `build_runner`"
and continue to the next, which is fine.

In every module this time, no discrimination