GH-9260: Fix IntegrationManagementConfiguration.obtainObservationPatterns() logic

Fixes: #9260

The current `IntegrationManagementConfiguration.obtainObservationPatterns()` is to always have an `*` as a first
pattern in the final result.
Because of `HashSet` natural order.
This would lead to ignore all the patterns, especially those with negation

* Fix `IntegrationManagementConfiguration.obtainObservationPatterns()` logic to ignore regular
patterns if `*` is present.
Optimization wise.
* Always put `*` into the end of final array let negative patterns to do their job
* Modify `IntegrationGraphServerTests` & `WebFluxObservationPropagationTests`
test configurations to ensure that `*` pattern does not have a precedence over negative patterns.

**Auto-cherry-pick to `6.3.x` & `6.2.x`**

spring-integration-webflux/src/test/java/org/springframework/integration/webflux/observation/WebFluxObservationPropagationTests.java

@@ -125,7 +125,7 @@ public class WebFluxObservationPropagationTests {
 	@Configuration
 	@EnableWebFlux
 	@EnableIntegration
-	@EnableIntegrationManagement(observationPatterns = "*")
+	@EnableIntegrationManagement(observationPatterns = "*,!notObserved*")
 	public static class ContextConfiguration {
 
 		@Bean
@@ -200,6 +200,8 @@ public class WebFluxObservationPropagationTests {
 					.transformWith(t -> t
 							.<String, String>transformer(String::toLowerCase)
 							.id("testTransformer"))
+					.channel("notObservedChannel")
+					.bridge(e -> e.id("notObservedEndpoint"))
 					.get();
 		}