feat(perl): add perlbrew auto activation (#12814)

Co-authored-by: Carlo Sala <carlosalag@protonmail.com>

plugins/perl/perl.plugin.zsh

@@ -54,3 +54,12 @@ pgs() { # [find] [replace] [filename]
 prep() { # [pattern] [filename unless STDOUT]
     perl -nle 'print if /'"$1"'/;' $2
 }
+
+# If the 'perlbrew' function isn't defined, perlbrew isn't setup.
+if [[ $ZSH_PERLBREW_ACTIVATE != false ]] && (( ! $+functions[perlbrew] )); then
+  local _perlbrew="${PERLBREW_ROOT:-${HOME}/perl5/perlbrew}"
+  if [[ -f "${_perlbrew}/etc/bashrc" ]]; then
+    source "${_perlbrew}/etc/bashrc"
+  fi
+  unset _perlbrew
+fi