Remove options allowing source ports to be specified

With the options allowing source ports to be specified being deprecated in 9.18 & 9.19/9.20, all the code associated with those options should subsequently be completely removed in the 9.21/9.22 cycle, as previously announced on bind-users:

https://lists.isc.org/pipermail/bind-users/2023-January/107165.html

The following features are going to be marked as ancient and made non-functional:

• specifying port in the following statements:

  • query-source
  • query-source-v6
  • transfer-source
  • transfer-source-v6
  • notify-source
  • notify-source-v6
  • parental-source
  • parental-source-v6

• the following statements as a whole:

  • use-v4-udp-ports
  • use-v6-udp-ports
  • avoid-v4-udp-ports
  • avoid-v6-udp-ports

See #3781 (closed) for the corresponding option deprecation issue.