Remove deprecated signatures of pgr_maxCardinalityMatch

[cvvergara]

• Official in version: 2.0.0
• Deprecated in v3.4.0:
• _pgr_maxcardinalitymatch(text,boolean)
• pgr_maxcardinalitymatch(text,boolean)

Tasks:

• Remove SQL deprecated signatures and functions
• pgtap tests to be done only on existing SQL functions
• Keeping deprecated internal C function
  • Moving to legacy will happen on v5