Introduce HASH_VERIFY env var (#50718)

To help solve part of the issue reported in #50627, exposing an env var
to toggle hash verification avoids the need to manually implement the
hashing.php file.

Author: valorin

config/hashing.php

@@ -30,7 +30,7 @@
 
     'bcrypt' => [
         'rounds' => env('BCRYPT_ROUNDS', 12),
-        'verify' => true,
+        'verify' => env('HASH_VERIFY', true),
     ],
 
     /*
@@ -48,7 +48,7 @@
         'memory' => env('ARGON_MEMORY', 65536),
         'threads' => env('ARGON_THREADS', 1),
         'time' => env('ARGON_TIME', 4),
-        'verify' => true,
+        'verify' => env('HASH_VERIFY', true),
     ],
 
     /*