Support Otlp Tracing's GRPC port from service connections

Otlp Tracing's exporter is configured using Transport. Current support
for service connections read the mapped port for HTTP transport 4318.
This commits adds support to read port for GRPC transport 4317.

See gh-41333

spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/otlp/OpenTelemetryTracingDockerComposeConnectionDetailsFactoryIntegrationTests.java

@@ -32,6 +32,7 @@ class OpenTelemetryTracingDockerComposeConnectionDetailsFactoryIntegrationTests
 
 	@DockerComposeTest(composeFile = "otlp-compose.yaml", image = TestImage.OPENTELEMETRY)
 	void runCreatesConnectionDetails(OtlpTracingConnectionDetails connectionDetails) {
+		assertThat(connectionDetails.getGrpcEndpoint()).startsWith("http://").endsWith("/v1/traces");
 		assertThat(connectionDetails.getUrl()).startsWith("http://").endsWith("/v1/traces");
 	}
 

spring-boot-project/spring-boot-docker-compose/src/dockerTest/resources/org/springframework/boot/docker/compose/service/connection/otlp/otlp-compose.yaml

@@ -2,4 +2,5 @@ services:
   otlp:
     image: '{imageName}'
     ports:
+      - '4317'
       - '4318'