chore: Remove useless play 25 directive, proper project naming, drop empty play-2.5

Author: bric3

dd-java-agent/instrumentation/play/play-2.4/build.gradle

@@ -2,20 +2,17 @@ muzzle {
   extraRepository("typesafe", "https://repo.typesafe.com/typesafe/maven-releases/")
 
   pass {
-    name = "play24and25"
     group = 'com.typesafe.play'
     module = 'play_2.11'
     versions = '[2.4.0,2.6)'
     assertInverse = true
   }
   fail {
-    name = "play24and25"
     group = 'com.typesafe.play'
     module = 'play_2.12'
     versions = '[,]'
   }
   fail {
-    name = "play24and25"
     group = 'com.typesafe.play'
     module = 'play_2.13'
     versions = '[,]'

dd-java-agent/instrumentation/play/play-2.4/src/main/java/datadog/trace/instrumentation/play24/PlayInstrumentation.java

@@ -19,11 +19,6 @@ public PlayInstrumentation() {
     super("play");
   }
 
-  @Override
-  public String muzzleDirective() {
-    return "play24and25";
-  }
-
   @Override
   public String hierarchyMarkerType() {
     return "play.api.mvc.Action";

dd-java-agent/instrumentation/play/play-2.5/build.gradle

@@ -2,7 +2,6 @@ muzzle {
   extraRepository("typesafe", "https://repo.typesafe.com/typesafe/maven-releases/")
 
   pass {
-    name = "play25only"
     group = 'com.typesafe.play'
     module = 'play_2.11'
     versions = '[2.5.0,2.6)'
@@ -34,7 +33,7 @@ tasks.withType(ScalaCompile).configureEach {
 addTestSuiteForDir('latestDepTest', 'test')
 
 dependencies {
-  implementation project(':dd-java-agent:instrumentation:play:play-2.5')
+  implementation project(':dd-java-agent:instrumentation:play:play-2.4')
 
   compileOnly group: 'com.typesafe.play', name: 'play_2.11', version: '2.5.0'
 
@@ -47,7 +46,7 @@ dependencies {
   testRuntimeOnly project(':dd-java-agent:instrumentation:scala:scala-promise:scala-promise-2.13')
 
   // All play modules for testing
-  testImplementation project(':dd-java-agent:instrumentation:play:play-2.4')
+  testRuntimeOnly project(':dd-java-agent:instrumentation:play:play-2.4')
 
   testImplementation group: 'com.typesafe.play', name: 'play-java_2.11', version: '2.5.0'
   testImplementation group: 'com.typesafe.play', name: 'play-java-ws_2.11', version: '2.5.0'