Remove redundant gradle (#9422)

conventions/src/main/kotlin/otel.bom-conventions.gradle.kts

@@ -32,21 +32,3 @@ afterEvaluate {
     }
   }
 }
-
-evaluationDependsOn(":dependencyManagement")
-val dependencyManagementConf = configurations.create("dependencyManagement") {
-  isCanBeConsumed = false
-  isCanBeResolved = false
-  isVisible = false
-}
-afterEvaluate {
-  configurations.configureEach {
-    if (isCanBeResolved && !isCanBeConsumed) {
-      extendsFrom(dependencyManagementConf)
-    }
-  }
-}
-
-dependencies {
-  add(dependencyManagementConf.name, platform(project(":dependencyManagement")))
-}