fix: Remove traceparent header (#1004) (#1005)

Author: clement-michelet

src/Tracing/HttpClient/AbstractTraceableHttpClient.php

@@ -94,7 +94,6 @@ public function request(string $method, string $url, array $options = []): Respo
         if (self::shouldAttachTracingHeaders($client, $uri)) {
             $headers['baggage'] = $childSpan->toBaggage();
             $headers['sentry-trace'] = $childSpan->toTraceparent();
-            $headers['traceparent'] = $childSpan->toW3CTraceparent();
         }
 
         $options['headers'] = $headers;

tests/Tracing/HttpClient/TraceableHttpClientTest.php

@@ -93,8 +93,8 @@ public function testRequest(): void
         $this->assertSame('GET', $response->getInfo('http_method'));
         $this->assertSame('https://username:password@www.example.com/test-page?foo=bar#baz', $response->getInfo('url'));
         $this->assertSame([\sprintf('sentry-trace: %s', $spans[1]->toTraceparent())], $mockResponse->getRequestOptions()['normalized_headers']['sentry-trace']);
-        $this->assertSame([\sprintf('traceparent: %s', $spans[1]->toW3CTraceparent())], $mockResponse->getRequestOptions()['normalized_headers']['traceparent']);
         $this->assertSame([\sprintf('baggage: %s', $transaction->toBaggage())], $mockResponse->getRequestOptions()['normalized_headers']['baggage']);
+        $this->assertArrayNotHasKey('traceparent', $mockResponse->getRequestOptions()['normalized_headers']);
         $this->assertNotNull($transaction->getSpanRecorder());
 
         $spans = $transaction->getSpanRecorder()->getSpans();