fix load tests

Author: aphralG

test/config/agent/nginx-agent-otel-load.conf

@@ -19,14 +19,14 @@ allowed_directories:
 
 collector:
   receivers:
-    otlp_receivers:
+    otlp:
       - server:
           host: "127.0.0.1"
           port: 4317
   processors:
     batch: {}
   exporters:
-    otlp_exporters:
+    otlp:
       - server:
           host: "127.0.0.1"
           port: 5643

test/mock/collector/nginx-agent.conf

@@ -43,7 +43,7 @@ collector:
         disk: {}
         network: {}
         filesystem: {}
-    otlp_receivers:
+    otlp:
       - server:
           host: "127.0.0.1"
           port: 4317
@@ -59,7 +59,7 @@ collector:
   processors:
     batch: {}
   exporters:
-    otlp_exporters:
+    otlp:
       - server:
           host: "otel-collector"
           port: 4317