Simplify generated endpointMetadata (#1176)

Author: jderusse

src/FirehoseClient.php

@@ -104,8 +104,8 @@ protected function getEndpointMetadata(?string $region): array
                 ];
             case 'us-iso-east-1':
                 return [
-                    'endpoint' => "https://firehose.$region.c2s.ic.gov",
-                    'signRegion' => $region,
+                    'endpoint' => 'https://firehose.us-iso-east-1.c2s.ic.gov',
+                    'signRegion' => 'us-iso-east-1',
                     'signService' => 'firehose',
                     'signVersions' => ['v4'],
                 ];
@@ -151,48 +151,6 @@ protected function getEndpointMetadata(?string $region): array
                     'signService' => 'firehose',
                     'signVersions' => ['v4'],
                 ];
-            case 'us-east-1':
-                return [
-                    'endpoint' => 'https://firehose.us-east-1.amazonaws.com',
-                    'signRegion' => 'us-east-1',
-                    'signService' => 'firehose',
-                    'signVersions' => ['v4'],
-                ];
-            case 'us-east-2':
-                return [
-                    'endpoint' => 'https://firehose.us-east-2.amazonaws.com',
-                    'signRegion' => 'us-east-2',
-                    'signService' => 'firehose',
-                    'signVersions' => ['v4'],
-                ];
-            case 'us-gov-east-1':
-                return [
-                    'endpoint' => 'https://firehose.us-gov-east-1.amazonaws.com',
-                    'signRegion' => 'us-gov-east-1',
-                    'signService' => 'firehose',
-                    'signVersions' => ['v4'],
-                ];
-            case 'us-gov-west-1':
-                return [
-                    'endpoint' => 'https://firehose.us-gov-west-1.amazonaws.com',
-                    'signRegion' => 'us-gov-west-1',
-                    'signService' => 'firehose',
-                    'signVersions' => ['v4'],
-                ];
-            case 'us-west-1':
-                return [
-                    'endpoint' => 'https://firehose.us-west-1.amazonaws.com',
-                    'signRegion' => 'us-west-1',
-                    'signService' => 'firehose',
-                    'signVersions' => ['v4'],
-                ];
-            case 'us-west-2':
-                return [
-                    'endpoint' => 'https://firehose.us-west-2.amazonaws.com',
-                    'signRegion' => 'us-west-2',
-                    'signService' => 'firehose',
-                    'signVersions' => ['v4'],
-                ];
         }
 
         return [