cubicweb #11569950 LoginController shouldn't return 200 on failed auth [validation pending]

403 seems like a much better return code...

prioritynormal
typebug
done in3.23.0
load0.500
load left0.000
closed by#f6938ae0dea8 [web] Have the LoginController return 403 on failed auth (closes #11569950)
patch[web] Have the LoginController return 403 on failed auth (closes #11569950) [applied]