[12.x] Refactor RedisTaggedCache@flush() to allow for custom connections (laravel#57122)

* Refactor flush method to improve redisPrefix retrieval

Refactor redisPrefix assignment to use instance checks.

* clean up

Author: cosmastech

src/Illuminate/Cache/RedisTaggedCache.php

@@ -112,9 +112,11 @@ public function flush()
     {
         $this->event(new CacheFlushing($this->getName()));
 
-        $redisPrefix = match ($this->store->connection()::class) {
-            PhpRedisConnection::class => $this->store->connection()->client()->getOption(\Redis::OPT_PREFIX),
-            PredisConnection::class => $this->store->connection()->client()->getOptions()->prefix,
+        $connection = $this->store->connection();
+        
+        $redisPrefix = match (true) {
+            $connection instanceof PhpRedisConnection => $connection->client()->getOption(\Redis::OPT_PREFIX),
+            $connection instanceof PredisConnection => $connection->client()->getOptions()->prefix,
         };
 
         $cachePrefix = $redisPrefix.$this->store->getPrefix();
@@ -143,16 +145,13 @@ public function flush()
             end
         LUA;
 
-        $this->store->connection()->eval(
+        $connection->eval(
             $script,
             count($keysToBeDeleted),
             ...$keysToBeDeleted,
             ...[$cachePrefix, ...$cacheTags]
         );
 
-        // $this->flushValues();
-        // $this->tags->flush();
-
         $this->event(new CacheFlushed($this->getName()));
 
         return true;