bug #49301 [HttpClient] Fix data collector (fancyweb)

This PR was merged into the 5.4 branch.

Discussion
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[HttpClient] Fix data collector

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | -
| Tickets       | symfony/symfony#49219
| License       | MIT
| Doc PR        | -

It fixes HTTP requests not showing anymore in the profiler panel because `lateCollect()` overrides `request_count` to 0.

It also fixes the wrong error count.

Commits
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8ec869e51e [HttpClient] Fix data collector

Author: nicolas-grekas

DataCollector/HttpClientDataCollector.php

@@ -43,8 +43,8 @@ public function collect(Request $request, Response $response, \Throwable $except
 
     public function lateCollect()
     {
-        $this->data['request_count'] = 0;
-        $this->data['error_count'] = 0;
+        $this->data['request_count'] = $this->data['request_count'] ?? 0;
+        $this->data['error_count'] = $this->data['error_count'] ?? 0;
         $this->data += ['clients' => []];
 
         foreach ($this->clients as $name => $client) {
@@ -59,7 +59,8 @@ public function lateCollect()
 
             $this->data['clients'][$name]['traces'] = array_merge($this->data['clients'][$name]['traces'], $traces);
             $this->data['request_count'] += \count($traces);
-            $this->data['error_count'] += $this->data['clients'][$name]['error_count'] += $errorCount;
+            $this->data['error_count'] += $errorCount;
+            $this->data['clients'][$name]['error_count'] += $errorCount;
 
             $client->reset();
         }