add applicant ID uniqueness validation
add applicant ID uniqueness validation

colinxfleming/medicaid_eligibility,HHSIDEAlab/medicaid_eligibility,dchealthlink/MITC,HHSIDEAlab/medicaid_eligibility,dchealthlink/MITC,colinxfleming/medicaid_eligibility,colinxfleming/medicaid_eligibility,colinxfleming/medicaid_eligibility,dchealthlink/MITC,HHSIDEAlab/medicaid_eligibility,dchealthlink/MITC,HHSIDEAlab/medicaid_eligibility