Nuke the log-decorator

[jrieken]

re #39572

@log(LogLevel.Info, 'CommandService', (msg, id) => `${msg}(${id})`)
executeCommand<T>(id: string, ...args: any[]): TPromise<T> {
  // ..
}	

This looks very pretty and I believe it's a prime-sample for a decorator but once you wanna debug calls to executeCommand you will hate it. Really hate it. My recommendation is nuke it or not recommend it...

[joaomoreno]

We nuke and treat it as a BUG!

[mjbvz]

Verified no more @log in code and that logging still happen as expected