Throw more specific error when deleting workspace

[mlorinc]

E.g:

  1) JBang codelens debug
       "after all" hook for "JBang.yaml codelens debug works":
     Error: EBUSY: resource busy or locked, rmdir 'D:\a\camel-dap-client-vscode\camel-dap-client-vscode\test-resources\ui-workbench'

The error is type of Error which can be thrown in more than this particular scenario. This event usually occurs when folder is still opened and used by VS Code.