refactor: improve MCP client timeout handling and reactive testing

- Add configurable initialization timeout separate from request timeout
- Rename ServletSse* test classes to HttpSse* for better naming consistency
- Replace direct .block() calls with StepVerifier for better reactive testing
- Change ping() method to return Mono instead of Mono
- Improve error handling and reactive programming patterns throughout tests
- Chain reactive operations for cleaner test flow

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Author: tzolov

mcp-spring/mcp-spring-webflux/src/test/java/io/modelcontextprotocol/client/WebFluxSseMcpAsyncClientTests.java

@@ -4,8 +4,6 @@
 
 package io.modelcontextprotocol.client;
 
-import java.time.Duration;
-
 import io.modelcontextprotocol.client.transport.WebFluxSseClientTransport;
 import io.modelcontextprotocol.spec.ClientMcpTransport;
 import org.junit.jupiter.api.Timeout;
@@ -48,9 +46,4 @@ public void onClose() {
 		container.stop();
 	}
 
-	@Override
-	protected Duration getTimeoutDuration() {
-		return Duration.ofMillis(300);
-	}
-
 }

mcp-spring/mcp-spring-webflux/src/test/java/io/modelcontextprotocol/client/WebFluxSseMcpSyncClientTests.java

@@ -4,8 +4,6 @@
 
 package io.modelcontextprotocol.client;
 
-import java.time.Duration;
-
 import io.modelcontextprotocol.client.transport.WebFluxSseClientTransport;
 import io.modelcontextprotocol.spec.ClientMcpTransport;
 import org.junit.jupiter.api.Timeout;
@@ -48,9 +46,4 @@ protected void onClose() {
 		container.stop();
 	}
 
-	@Override
-	protected Duration getTimeoutDuration() {
-		return Duration.ofMillis(300);
-	}
-
 }