Decouple test JDK and gradle JDK in testng latestDepTest

Author: smola

dd-java-agent/instrumentation/testng/testng-7/build.gradle

@@ -2,6 +2,11 @@ plugins {
   id 'java-test-fixtures'
 }
 
+ext {
+  // testng 7.6.0+ requires Java 11 or higher.
+  latestDepTestMinJavaVersionForTests = JavaVersion.VERSION_11
+}
+
 apply from: "$rootDir/gradle/java.gradle"
 
 muzzle {
@@ -21,6 +26,8 @@ muzzle {
 }
 
 addTestSuiteForDir('latestDepTest', 'test')
+// testng 7.5.1 is the latest version compatible with Java 8
+addTestSuiteForDir('testng751Test', 'test')
 
 dependencies {
   compileOnly group: 'org.testng', name: 'testng', version: '7.0.0'
@@ -29,7 +36,7 @@ dependencies {
 
   testImplementation testFixtures(project(':dd-java-agent:instrumentation:testng'))
   testImplementation group: 'org.testng', name: 'testng', version: '7.0.0'
-
+  testng751TestImplementation group: 'org.testng', name: 'testng', version: '7.5.1'
   latestDepTestImplementation group: 'org.testng', name: 'testng', version: '+'
 }
 
@@ -41,9 +48,3 @@ configurations.matching({ it.name.startsWith('test') }).each({
   }
 })
 
-configurations.matching({ it.name.startsWith('latestDepTest') }).each({
-  it.resolutionStrategy {
-    // TestNG 7.6+ is compiled with Java 11
-    force group: 'org.testng', name: 'testng', version: (JavaVersion.current().java11Compatible ? '+' : '7.5')
-  }
-})