Rename example class, and improve test

Author: kabir

integrations/microprofile-config/README.md

@@ -104,7 +104,7 @@ import jakarta.inject.Inject;
 @ApplicationScoped
 @Alternative
 @Priority(100)  // Higher than MicroProfileConfigProvider's priority of 50
-public class SpringConfigProvider implements A2AConfigProvider {
+public class OtherEnvironmentConfigProvider implements A2AConfigProvider {
 
     @Inject
     Environment env;

integrations/microprofile-config/src/test/resources/application.properties

@@ -9,3 +9,6 @@ a2a.executor.core-pool-size=15
 
 # Exclude beans that aren't needed for config testing
 quarkus.arc.exclude-types=io.a2a.server.requesthandlers.*,io.a2a.server.agentexecution.*,io.a2a.server.tasks.*,io.a2a.server.events.*,io.a2a.server.util.*
+
+# Property that will be overridden by a system property
+a2a.test.system.property=from-application-properties