minor #21875 Rename TimeZoneTransformer into TimezoneTransformer (lepiaf)

This PR was submitted for the 3.2 branch but it was merged into the 3.3-dev branch instead (closes #21875).

Discussion
----------

Rename TimeZoneTransformer into TimezoneTransformer

| Q             | A
| ------------- | ---
| Branch?       | 3.2
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11028
| License       | MIT
| Doc PR        | no
#

Commits
-------

dba163950b Rename TimeZoneTransformer into TimezoneTransformer

src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php

@@ -67,7 +67,7 @@ class FullTransformer
             'k' => new Hour2401Transformer(),
             'm' => new MinuteTransformer(),
             's' => new SecondTransformer(),
-            'z' => new TimeZoneTransformer(),
+            'z' => new TimezoneTransformer(),
         );
     }
 

src/Symfony/Component/Intl/DateFormatter/DateFormat/TimezoneTransformer.php

@@ -20,7 +20,7 @@ use Symfony\Component\Intl\Exception\NotImplementedException;
  *
  * @internal
  */
-class TimeZoneTransformer extends Transformer
+class TimezoneTransformer extends Transformer
 {
     /**
      * {@inheritdoc}

src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php

@@ -541,7 +541,7 @@ class IntlDateFormatter
         // Get an Etc/GMT time zone that is accepted for \DateTimeZone
         if ('GMT' !== $timeZoneId && 0 === strpos($timeZoneId, 'GMT')) {
             try {
-                $timeZoneId = DateFormat\TimeZoneTransformer::getEtcTimeZoneId($timeZoneId);
+                $timeZoneId = DateFormat\TimezoneTransformer::getEtcTimeZoneId($timeZoneId);
             } catch (\InvalidArgumentException $e) {
                 // Does nothing, will fallback to UTC
             }