Section 8. A claim for compensation brought under this chapter shall be commenced within 3 years after either the grant of a pardon or the grant of judicial relief and satisfaction of other conditions described in subsection (B) of section 1. Any action by the commonwealth challenging or appealing the grant of such judicial relief shall toll the 3 year period. Every action brought pursuant to this chapter that is not commenced within the time required by this section is forever barred from consideration by the courts of the commonwealth.