minor #57246 [HttpKernel] Remove @internal flag and add @final to ServicesResetter (lyrixx)

This PR was merged into the 7.2 branch.

Discussion
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[HttpKernel] Remove ``@internal`` flag and add ``@final`` to `ServicesResetter`

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Issues        |
| License       | MIT

I used this class for ages! I moved many of my internal "hack" to symfony (messenger, etc)
But there are still a lot of use cases where we could need this class:

* Custom worker that does not use messenger
* import/export command that process a lot of rows (doctrine/dbal leak by default, even in prod env)
* etc

---

Anyway, I used this class, and I never noticed it was internal. And today, I showed this class to `@pyrech`
and its IDE displayed the class in strikethrough! (vscode does not do that...)

So I think it's time to open this class.

Commits
-------

6b1032f59b Remove ``@internal`` flag and add ``@final`` to `ServicesResetter`

Author: fabpot

CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+7.2
+---
+
+ * Remove `@internal` flag and add `@final` to `ServicesResetter`
+
 7.1
 ---
 

DependencyInjection/ServicesResetter.php

@@ -21,7 +21,7 @@
  * @author Alexander M. Turek <me@derrabus.de>
  * @author Nicolas Grekas <p@tchwork.com>
  *
- * @internal
+ * @final since Symfony 7.2
  */
 class ServicesResetter implements ResetInterface
 {