[HttpClient] Content doesn't get decoded when fetched from an exception

[HypeMC]

Q	A
Branch?	4.4
Bug fix?	yes
New feature?	no
Deprecations?	no
Tickets	-
License	MIT
Doc PR	-

My previous PR #38493 created a new bug, the content doesn't get decoded when fetched from an exception because the inflate resource gets unset:

<?php

use Symfony\Component\HttpClient\CurlHttpClient;
use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;

include __DIR__.'/symfony/vendor/autoload.php';

$client = new CurlHttpClient();

try {
    $client->request('GET', 'http://example.com/404');
} catch (ClientExceptionInterface $exception) {
    echo $exception->getResponse()->getContent(false);
}

I've removed the part where the resource gets unset since it still might be used at some point.

The test is implementation independent so I believe it should go in contracts, please correct me if I wrong. Also, I was unable to find a way to do the test without adding a new endpoint this time, any suggestions would be appreciated.

[nicolas-grekas]

Thank you @HypeMC.