tracing: Add otel tracer transport to all http clients (#14972)

* Fixed otelhttp client setups.

Note: This may not be the best solution as the http client is defined in many places. There should be a canoncial http client with the proper setup.

* Changelog fragment

* go mod tidy and gazelle

validator/keymanager/remote-web3signer/internal/BUILD.bazel

@@ -19,6 +19,7 @@ go_library(
         "@com_github_prometheus_client_golang//prometheus:go_default_library",
         "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
+        "@io_opentelemetry_go_contrib_instrumentation_net_http_otelhttp//:go_default_library",
     ],
 )
 

validator/keymanager/remote-web3signer/internal/client.go

@@ -20,6 +20,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing"
 	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	"github.com/sirupsen/logrus"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 )
 
 const (
@@ -56,7 +57,7 @@ func NewApiClient(baseEndpoint string) (*ApiClient, error) {
 	}
 	return &ApiClient{
 		BaseURL:    u,
-		RestClient: &http.Client{},
+		RestClient: &http.Client{Transport: otelhttp.NewTransport(http.DefaultTransport)},
 	}, nil
 }