feat: v1 trace protocol implementation (#3947 cherry pick) (#4085)

Co-authored-by: darccio <[email protected]>

Author: hannahkm

.github/workflows/system-tests.yml

@@ -136,6 +136,8 @@ jobs:
             scenario: AGENT_SUPPORTING_SPAN_EVENTS
           - weblog-variant: net-http
             scenario: TELEMETRY_METRIC_GENERATION_DISABLED
+          - weblog-variant: net-http
+            scenario: APM_TRACING_EFFICIENT_PAYLOAD
       fail-fast: false
     env:
       TEST_LIBRARY: golang

contrib/aws/datadog-lambda-go/test/integration_tests/error/go.mod

@@ -18,7 +18,7 @@ require (
 	github.com/DataDog/datadog-agent/pkg/util/scrubber v0.71.0 // indirect
 	github.com/DataDog/datadog-agent/pkg/version v0.71.0 // indirect
 	github.com/DataDog/datadog-go/v5 v5.6.0 // indirect
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev // indirect
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1 // indirect
 	github.com/DataDog/go-libddwaf/v4 v4.6.1 // indirect
 	github.com/DataDog/go-runtime-metrics-internal v0.0.4-0.20250721125240-fdf1ef85b633 // indirect
 	github.com/DataDog/go-sqllexer v0.1.8 // indirect

contrib/aws/datadog-lambda-go/test/integration_tests/hello/go.mod

@@ -10,7 +10,7 @@ go 1.24.0
 require (
 	github.com/DataDog/dd-trace-go/contrib/aws/datadog-lambda-go/v2 v2.0.0-00010101000000-000000000000
 	github.com/DataDog/dd-trace-go/contrib/net/http/v2 v2.0.0-00010101000000-000000000000
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1
 	github.com/aws/aws-lambda-go v1.46.0
 )
 

contrib/dimfeld/httptreemux.v5/go.mod

@@ -4,7 +4,7 @@ go 1.24.0
 
 require (
 	github.com/DataDog/dd-trace-go/contrib/net/http/v2 v2.4.0-dev
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1
 	github.com/dimfeld/httptreemux/v5 v5.5.0
 	github.com/stretchr/testify v1.11.1
 )

contrib/google.golang.org/api/go.mod

@@ -4,7 +4,7 @@ go 1.24.0
 
 require (
 	github.com/DataDog/dd-trace-go/contrib/net/http/v2 v2.4.0-dev
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1
 	github.com/stretchr/testify v1.11.1
 	golang.org/x/oauth2 v0.30.0
 	google.golang.org/api v0.169.0

contrib/google.golang.org/grpc/go.mod

@@ -4,7 +4,7 @@ go 1.24.0
 
 require (
 	github.com/DataDog/dd-trace-go/instrumentation/testutils/grpc/v2 v2.4.0-dev
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1
 	github.com/stretchr/testify v1.11.1
 	github.com/tinylib/msgp v1.3.0
 	google.golang.org/grpc v1.75.0

contrib/gorilla/mux/go.mod

@@ -4,7 +4,7 @@ go 1.24.0
 
 require (
 	github.com/DataDog/dd-trace-go/contrib/net/http/v2 v2.4.0-dev
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1
 	github.com/gorilla/mux v1.8.1
 	github.com/stretchr/testify v1.11.1
 )

contrib/gorm.io/gorm.v1/go.mod

@@ -6,7 +6,7 @@ godebug x509negativeserial=1
 
 require (
 	github.com/DataDog/dd-trace-go/contrib/database/sql/v2 v2.4.0-dev
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1
 	github.com/go-sql-driver/mysql v1.6.0
 	github.com/jackc/pgx/v5 v5.6.0
 	github.com/lib/pq v1.10.2

contrib/hashicorp/vault/go.mod

@@ -4,7 +4,7 @@ go 1.24.0
 
 require (
 	github.com/DataDog/dd-trace-go/contrib/net/http/v2 v2.4.0-dev
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1
 	github.com/hashicorp/vault/api v1.15.0
 	github.com/hashicorp/vault/sdk v0.15.0
 	github.com/stretchr/testify v1.11.1

contrib/jmoiron/sqlx/go.mod

@@ -6,7 +6,7 @@ godebug x509negativeserial=1
 
 require (
 	github.com/DataDog/dd-trace-go/contrib/database/sql/v2 v2.4.0-dev
-	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-rc.1
 	github.com/denisenkom/go-mssqldb v0.11.0
 	github.com/go-sql-driver/mysql v1.6.0
 	github.com/jmoiron/sqlx v1.3.5