Move docker-compose logging statement to debug (#52107)

When docker-compose is required for a test fixture but is not
available, we warn log a message to this effect. This ends up being
noise during configuration, especially when working locally. This
commit changes the logging level of these messages to debug.

buildSrc/src/main/java/org/elasticsearch/gradle/testfixtures/TestFixturesPlugin.java

@@ -136,7 +136,7 @@ public void apply(Project project) {
 
         if (dockerComposeSupported() == false) {
             project.getLogger()
-                .warn(
+                .info(
                     "Tests for {} require docker-compose at /usr/local/bin/docker-compose or /usr/bin/docker-compose "
                         + "but none could be found so these will be skipped",
                     project.getPath()