cubicweb-skos #9133216 Remove fake_form monkeypatch once skos depends on CW 3.21 [validation pending]

The monkeypatch imports cubicweb.devtools.testlib which has side effects e.g. MockSMTP is used instead of smtplib.SMTP in cubes using the skos cube, outside of tests

priorityimportant
typebug
done in0.10.0
load left0.000
closed by#b1d3d335bb51 [site_cubicweb] Remove monkeypatch unnecessary for cw >= 3.20.5
patch[site_cubicweb] Remove monkeypatch unnecessary for cw >= 3.20.5 [applied][site_cubicweb] Use fake_form from CW instead of monkeypatch [applied]