[a2a] Disable stress tests

Author: EugeneTheDev

a2a/a2a-server/src/jvmTest/kotlin/ai/koog/a2a/server/jsonrpc/StressA2AServerJsonRpcIntegrationTest.kt

@@ -2,6 +2,7 @@ package ai.koog.a2a.server.jsonrpc
 
 import org.junit.jupiter.api.AfterAll
 import org.junit.jupiter.api.BeforeAll
+import org.junit.jupiter.api.Disabled
 import org.junit.jupiter.api.RepeatedTest
 import org.junit.jupiter.api.TestInstance
 import org.junit.jupiter.api.parallel.Execution
@@ -15,6 +16,7 @@ import kotlin.time.Duration.Companion.seconds
  */
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 @Execution(ExecutionMode.SAME_THREAD, reason = "Working with the same instance of test server.")
+@Disabled("TODO add stress tests in heavy tests only") // TODO add in heavy tests
 class StressA2AServerJsonRpcIntegrationTest : BaseA2AServerJsonRpcTest() {
     override val testTimeout = 10.seconds