List out test failures in CI log (opensearch-project#1737)

Signed-off-by: cliu123 <[email protected]>

build.gradle

@@ -394,3 +394,28 @@ buildDeb {
     arch = 'all'
     archiveName "${packageName}-${version}.deb"
 }
+
+allprojects {
+    // add a collection to track failedTests
+    ext.failedTests = []
+
+    // add a testlistener to all tasks of type Test
+    tasks.withType(Test) {
+        afterTest { TestDescriptor descriptor, TestResult result ->
+            if(result.resultType == org.gradle.api.tasks.testing.TestResult.ResultType.FAILURE){
+                failedTests << ["${descriptor.className}::${descriptor.name}"]
+            }
+        }
+    }
+
+    // print out tracked failed tests when the build has finished
+    gradle.buildFinished {
+        if(!failedTests.empty){
+            println "Failed tests for ${project.name}:"
+            failedTests.each { failedTest ->
+                println failedTest
+            }
+            println ""
+        }
+    }
+}