[TASK] Drop a "probably not required" method from routing

Method addArguments() of Route class is marked as
'@deprecated Probably not required'. It looks like
a left over from the routing development. The method is
indeed unused and can be dropped without further
notice from this @internal marked class.

Change-Id: Iefaec031003b55571c5d2f0f658fed9b25132cbb
Resolves: #87488
Releases: master.
Reviewed-on: https://review.typo3.org/59486
Tested-by: TYPO3com <noreply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>

typo3/sysext/core/Classes/Routing/Route.php

@@ -64,25 +64,6 @@ public function getArguments(): array
         return $this->getOption('_arguments') ?? [];
     }
 
-    /**
-     * @param array $arguments
-     * @deprecated Probably not required
-     */
-    public function addArguments(array $arguments)
-    {
-        $mergedArguments = $this->getArguments();
-        foreach ($arguments as $key => $argument) {
-            if (isset($mergedArguments[$key])) {
-                throw new \OverflowException(
-                    sprintf('Cannot override argument %s', $key),
-                    1538326790
-                );
-            }
-            $mergedArguments[$key] = $argument;
-        }
-        $this->setOption('_arguments', $mergedArguments);
-    }
-
     /**
      * @return EnhancerInterface|null
      */