Remove explicit loading AMQP plugin in Gru plugin

The plugin gets loaded automatically via OpenQA::Setup

Author: perlpunk

lib/OpenQA/Shared/Plugin/Gru.pm

@@ -98,19 +98,6 @@ sub register ($self, $app, $config) {
         });
 
     $self->register_tasks;
-    my $plugins = $app->config->{global}->{plugins};
-    if (defined $plugins && $plugins =~ /\bAMQP\b/) {
-        push @{$app->plugins->namespaces}, 'OpenQA::WebAPI::Plugin'    # uncoverable statement
-          unless grep { $_ eq 'OpenQA::WebAPI::Plugin' } @{$app->plugins->namespaces};
-
-        try {
-            $app->plugin('AMQP');
-            Mojo::IOLoop->singleton->one_tick;    # handle async plugin registration
-        }
-        catch ($e) {
-            log_error("Failed to load AMQP plugin for Gru: $e");
-        }
-    }
 
     # Enable the Minion Admin interface under /minion
     my $auth = $app->routes->under('/minion')->to('session#ensure_admin');