Make auto-configured BraveTracer back off when user defines a Tracer

Closes gh-33095

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/BraveAutoConfiguration.java

@@ -160,7 +160,7 @@ public class BraveAutoConfiguration {
 	}
 
 	@Bean
-	@ConditionalOnMissingBean
+	@ConditionalOnMissingBean(io.micrometer.tracing.Tracer.class)
 	BraveTracer braveTracerBridge(brave.Tracer tracer, CurrentTraceContext currentTraceContext) {
 		return new BraveTracer(tracer, new BraveCurrentTraceContext(currentTraceContext), BRAVE_BAGGAGE_MANAGER);
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/BraveAutoConfigurationTests.java

@@ -113,8 +113,8 @@ class BraveAutoConfigurationTests {
 			assertThat(context).hasSingleBean(HttpServerHandler.class);
 			assertThat(context).hasBean("customHttpClientHandler");
 			assertThat(context).hasSingleBean(HttpClientHandler.class);
-			assertThat(context).hasBean("customBraveTracer");
-			assertThat(context).hasSingleBean(BraveTracer.class);
+			assertThat(context).hasBean("customMicrometerTracer");
+			assertThat(context).hasSingleBean(io.micrometer.tracing.Tracer.class);
 			assertThat(context).hasBean("customBraveBaggageManager");
 			assertThat(context).hasSingleBean(BraveBaggageManager.class);
 			assertThat(context).hasBean("customBraveHttpServerHandler");
@@ -397,8 +397,8 @@ class BraveAutoConfigurationTests {
 		}
 
 		@Bean
-		BraveTracer customBraveTracer() {
-			return mock(BraveTracer.class);
+		io.micrometer.tracing.Tracer customMicrometerTracer() {
+			return mock(io.micrometer.tracing.Tracer.class);
 		}
 
 		@Bean