Remove chown from onCreateCommand

[wba2hi]

The chown command can be removed, because it no longer has any impact.
The devcontainer is always created as the user "vscode" as defined in .devcontainer.json and / or DOCKERFILE

Tested the following scenarios:

• delete devcontainer (e.g. using colima delete) (before doing everything else)
• recreate devcontainer
• execute "velocitas init -fv"
• add door.proto, add configuration to appmanifest.json and "re-generate gRPC files"
• generate vehicle-model
• start / stop runtime-local

Tested using the following branch:
https://github.com/SoftwareDefinedVehicle/vehicle-app-cpp-template/tree/remove_chown_test

[BjoernAtBosch]

LGTM