Add logback-test.xml and make sure SLF4J 2 is used in tests

encoder-brave/pom.xml

@@ -65,6 +65,12 @@
       <artifactId>armeria-junit5</artifactId>
       <version>${armeria.version}</version>
       <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <groupId>org.slf4j</groupId>
+          <artifactId>*</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>org.testcontainers</groupId>

encoder-brave/src/test/resources/logback-test.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%-30thread] %-5level %-48logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <statusListener class="ch.qos.logback.core.status.NopStatusListener"/>
+    <logger name="zipkin2" level="DEBUG"/>
+</configuration>