Call the scripts instead of sourcing them

[kfcampbell]

Sourcing the scripts will load functionality from them but not execute it. This small update causes the install-tools.sh script's code to be executed. Another way to do this would be to refactor the script to export a function and then call that function in each parent script; I've elected to go this way because it's fewer lines but I'm happy to change that as desired.

On this branch:

 sh$ ./scripts/generate-go.sh
The correct version (1.8.1) of microsoft.openapi.kiota is installed...skipping install step
+ go run schemas/main.go --schema-next=false
2023/11/07 11:00:00 Downloading latest schema from descriptions directory

On main:

 sh$ ./scripts/generate-go.sh
./scripts/generate-go.sh: 10: source: not found
+ go run schemas/main.go --schema-next=false

I'm not sure why my environment is unable to recognize source.

[nickfloyd]

Oh great catch! ❤️