They're all still in the current Monterey beta (21A5294g) but python2 says (paraphrasing) "this is only for compatibility; it might not be here in future"
It wasn't in the above list, but Apple did completely remove PHP in Monterey.
On a current MBA/M1, which came with Big Sur:
% which perl
/usr/bin/perl
% which python2
/usr/bin/python2
% which python3
/usr/bin/python3
% which ruby
/usr/bin/ruby