Improve Error Message for Invalid Token in devguard-scanner

[refoo0]

Improve Error Message for Invalid Token in devguard-scanner now: devguard-scanner/main.go:548 software composition analysis failed err="could not parse hexPrivKey\ncould not sign request\nmain.init.0.func2.scaCommandFactory.1\n\t/app/cmd/devguard-scanner/main.go:474\nmain.init.0.func2\n\t/app/cmd/devguard-scanner/main.go:546\ngithub.com/spf13/cobra.(*Command).execute\n\t/go/pkg/mod/github.com/spf13/[email protected]/command.go:989\ngithub.com/spf13/cobra.(*Command).ExecuteC\n\t/go/pkg/mod/github.com/spf13/[email protected]/command.go:1117\ngithub.com/spf13/cobra.(*Command).Execute\n\t/go/pkg/mod/github.com/spf13/[email protected]/command.go:1041\nmain.Execute\n\t/app/cmd/devguard-scanner/main.go:55\nmain.main\n\t/app/cmd/devguard-scanner/main.go:587\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:272\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1700"