Rename `useInstalledDotNetCli` to `use_installed_dotnet_cli` bootstrapper Bash variable

- [x] renamed in Arcade
- [ ] rename in https://github.com/dotnet/standard
- [ ] rename in https://github.com/dotnet/sdk
- [ ] rename in https://github.com/dotnet/cli

other repos?
