Remove the custom completion command

Symfony 5.4 and up comes with a built-in completion command, see:

https://symfony.com/doc/5.4/console/input.html#adding-argument-option-value-completion

And any customisation to it can be done from within the rest of
commands.

So we don't need the stecman/symfony-console-completion library
neither the custom CompletionCommand any more.

This commit just removes it all completely.

bin/moodle-plugin-ci

@@ -16,7 +16,6 @@ use MoodlePluginCI\Command\AddPluginCommand;
 use MoodlePluginCI\Command\BehatCommand;
 use MoodlePluginCI\Command\CodeCheckerCommand;
 use MoodlePluginCI\Command\CodeFixerCommand;
-use MoodlePluginCI\Command\CompletionCommand;
 use MoodlePluginCI\Command\CopyPasteDetectorCommand;
 use MoodlePluginCI\Command\CoverallsUploadCommand;
 use MoodlePluginCI\Command\GruntCommand;
@@ -76,7 +75,6 @@ $application->add(new AddPluginCommand(ENV_FILE));
 $application->add(new BehatCommand());
 $application->add(new CodeCheckerCommand());
 $application->add(new CodeFixerCommand());
-$application->add(new CompletionCommand());
 $application->add(new CopyPasteDetectorCommand());
 $application->add(new CoverallsUploadCommand());
 $application->add(new GruntCommand());

composer.json

@@ -80,7 +80,6 @@
     "php-parallel-lint/php-console-highlighter": "^1.0.0",
     "psr/log": "^1.1.4",
     "nikic/php-parser": "^4.14",
-    "stecman/symfony-console-completion": "^0.11.0",
     "marcj/topsort": "^2.0.0",
     "phpcompatibility/php-compatibility": "dev-develop#2fb82334"
   },