Add service connection from OpenTelemetry Collector

See gh-35082

spring-boot-project/spring-boot-testcontainers/src/test/resources/collector-config.yml

@@ -0,0 +1,20 @@
+receivers:
+  otlp:
+    protocols:
+      grpc:
+      http:
+
+exporters:
+  # https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/exporter/prometheusexporter
+  prometheus:
+    endpoint: '0.0.0.0:9090'
+    metric_expiration: 1m
+    enable_open_metrics: true
+    resource_to_telemetry_conversion:
+      enabled: true
+
+service:
+  pipelines:
+    metrics:
+      receivers: [otlp]
+      exporters: [prometheus]