[receiver/nginx] Use NewDefaultClientConfig instead of manually creating struct (open-telemetry#35452)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
Similar to
open-telemetry/opentelemetry-collector#11273.
This PR makes usage of the `NewDefaultClientConfig` instead of manually
creating the `confighttp.ClientConfig` struct as part of
open-telemetry#35457.

**Link to tracking Issue:** <Issue number if applicable>
open-telemetry#35457

**Testing:** <Describe what testing was performed and which tests were
added.>

**Documentation:** <Describe the documentation added.>

---------

Signed-off-by: ChrsMark <[email protected]>

Author: ChrsMark

receiver/nginxreceiver/factory.go

@@ -28,12 +28,13 @@ func createDefaultConfig() component.Config {
 	cfg := scraperhelper.NewDefaultControllerConfig()
 	cfg.CollectionInterval = 10 * time.Second
 
+	clientConfig := confighttp.NewDefaultClientConfig()
+	clientConfig.Endpoint = "http://localhost:80/status"
+	clientConfig.Timeout = 10 * time.Second
+
 	return &Config{
-		ControllerConfig: cfg,
-		ClientConfig: confighttp.ClientConfig{
-			Endpoint: "http://localhost:80/status",
-			Timeout:  10 * time.Second,
-		},
+		ControllerConfig:     cfg,
+		ClientConfig:         clientConfig,
 		MetricsBuilderConfig: metadata.DefaultMetricsBuilderConfig(),
 	}
 }