A cadre of 36 City Council candidates are calling on Councilman Joe Borelli to apologize after the Staten Island legislator fired off a controversial letter demanding an end to Brooklyn’s popular West Indian Day Parade — which the would-be pols deemed an unwarranted “racist” attack on a majority-Black celebration.  “We are deeply disgusted by your racist call to end our West Indian Day Parade. Every single parade, no matter which part of our wonderful diversity as Americans it celebrates, requires additional …