Finger-pointing has erupted over the Kamala Harris campaign blowing up to $20 million on swing-state concerts Monday night, hours before the VP’s spectacular election loss to Donald Trump — prompting concern that everyday staff and vendors won’t get paid amid reports the campaign is in debt by the same amount. Members of the defeated Harris team tell The Post that the concerts had a ruinous effect on the Democratic campaign’s coffers and that fact was no secret — with one planned performance by ’90s alt-rock goddess Alanis Morissette getting scrapped to save money. The seven swing-state concerts on election eve...