Utilities/Scripts: Drop CommandArgument lexer/parser generation step

This was missed in commit 292aaffb78 (Source: Remove unused
cmCommandArgument{Lexer,Parser}, 2024-12-09, v4.0.0-rc1~156^2~3).

Utilities/Scripts/regenerate-lexers.bash

@@ -12,7 +12,6 @@ pushd "${BASH_SOURCE%/*}/../../Source/LexerParser" > /dev/null
 extra_args_CommandArgument="--never-interactive --batch"
 
 for lexer in            \
-    CommandArgument     \
     CTestResourceGroups \
     DependsJava         \
     Expr                \

Utilities/Scripts/regenerate-parsers.bash

@@ -10,7 +10,6 @@ fi
 pushd "${BASH_SOURCE%/*}/../../Source/LexerParser" > /dev/null
 
 for parser in            \
-    CommandArgument     \
     DependsJava         \
     Expr                \
     Fortran