Clean up isolation WPs in rel22

This MR removes some obsolete/unavailable isolation WPs from IsolationSelectionTool.

PLV WPs are temporally removed since PLV is not working yet

particle	WP
muon	FixedCutLoosePLV
	PLVLoose
	PLVTight
electron	FixedCutLoosePLV
	PLVLoose
	PLVLoose_noLooseCone
	PLVTight
	PLVTight_noLooseCone

Gradient WPs are not supported

particle	WP
electron	Gradient
	Gradient_exp
	GradientLoose

WPs using not recommended isolation variables are removed

particle	WP
muon	FixedCutHighPtTrackOnly
electron	FixedCutTight
	FixedCutTightTrackOnly
	FixedCutLoose
	FCTight_FixedRad
	FCLoose_FixedRad
	FCTight
	FCLoose
	FixedCutPflowTight
	FixedCutPflowLoose
	TightTrackCone40

tagging @htorres and @fcardill tagging @mvanadia , @gartoni , @jmaurer and @jpoveda as well