feat: refactor authorization handling across files

- Remove the unused import for `encoding/base64`
- Update the authorization header handling in the `InitOtelAPM` function

Signed-off-by: Sinh <luuvansinh555@gmail.com>

apm.go

@@ -2,7 +2,6 @@ package apm
 
 import (
 	"context"
-	"encoding/base64"
 
 	"github.com/labstack/echo/v4"
 	"go.mongodb.org/mongo-driver/event"
@@ -29,8 +28,7 @@ var (
 type OtelConfig struct {
 	Endpoint       string
 	Path           string
-	AuthUser       string
-	AuthPwd        string
+	AuthHeader     string
 	ServiceName    string
 	ServiceVersion string
 	Env            string
@@ -45,8 +43,8 @@ func InitOtelAPM(config OtelConfig) error {
 	otlptracehttp.NewClient()
 
 	authHeaders := map[string]string{}
-	if config.AuthUser != "" && config.AuthPwd != "" {
-		authHeaders["Authorization"] = "Basic " + base64.StdEncoding.EncodeToString([]byte(config.AuthUser+":"+config.AuthPwd))
+	if config.AuthHeader != "" {
+		authHeaders["Authorization"] = config.AuthHeader
 	}
 	otlpHTTPExporter, err := otlptracehttp.New(context.Background(),
 		otlptracehttp.WithEndpoint(config.Endpoint),