yazi: add shellWrapperName & rename wrappers to yy

The program shell wrappers have been renamed from `ya` to `yy`
following the introduction of the new CLI tool named `ya`.

With this in mind, the `shellWrapperName` option has been introduced
to provide users with more flexibility in choosing the name they're
most accustomed to (ra, lf, ...).

Co-authored-by: XYenon <register@xyenon.bid>

Co-authored-by: 三咲雅 · Misaki Masa <sxyazi@gmail.com>

tests/modules/programs/yazi/bash-integration-enabled.nix

@@ -2,7 +2,7 @@
 
 let
   shellIntegration = ''
-    function ya() {
+    function yy() {
       local tmp="$(mktemp -t "yazi-cwd.XXXXX")"
       yazi "$@" --cwd-file="$tmp"
       if cwd="$(cat -- "$tmp")" && [ -n "$cwd" ] && [ "$cwd" != "$PWD" ]; then

tests/modules/programs/yazi/fish-integration-enabled.nix

@@ -2,7 +2,7 @@
 
 let
   shellIntegration = ''
-    function ya
+    function yy
       set tmp (mktemp -t "yazi-cwd.XXXXX")
       yazi $argv --cwd-file="$tmp"
       if set cwd (cat -- "$tmp"); and [ -n "$cwd" ]; and [ "$cwd" != "$PWD" ]

tests/modules/programs/yazi/nushell-integration-enabled.nix

@@ -2,7 +2,7 @@
 
 let
   shellIntegration = ''
-    def --env ya [...args] {
+    def --env yy [...args] {
       let tmp = (mktemp -t "yazi-cwd.XXXXX")
       yazi ...$args --cwd-file $tmp
       let cwd = (open $tmp)

tests/modules/programs/yazi/zsh-integration-enabled.nix

@@ -2,7 +2,7 @@
 
 let
   shellIntegration = ''
-    function ya() {
+    function yy() {
       local tmp="$(mktemp -t "yazi-cwd.XXXXX")"
       yazi "$@" --cwd-file="$tmp"
       if cwd="$(cat -- "$tmp")" && [ -n "$cwd" ] && [ "$cwd" != "$PWD" ]; then