Update to JUnit5 across all modules (#1668)

* Updated saga to JUnit 5

* Update fix for CI job in trampoline module

* Updated update-method module to JUnit 5

* Upgraded to latest JUnit Jupiter
JUnit 4 is not needed when using JUnit-Vintage

* Reverted change to access modifier on Trampoline

* Cleanup to resolve code smells

* Formatting

* Formatting

* Migrating to JUnit5 and updating some Mockito patterns

* Migrating to JUnit5

* Migrating to JUnit5

* Migrating to JUnit 5

* Formatting cleanup

* Added missing scope for junit

* Fixed tests that were not running previously.

Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>

double-buffer/src/test/java/com/iluwatar/doublebuffer/AppTest.java

@@ -23,14 +23,14 @@
 
 package com.iluwatar.doublebuffer;
 
-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 
+import org.junit.jupiter.api.Test;
+
 /**
  * App unit test.
  */
-public class AppTest {
+class AppTest {
 
   /**
    * Issue: Add at least one assertion to this test case.
@@ -40,7 +40,7 @@ public class AppTest {
    */
 
   @Test
-  public void shouldExecuteApplicationWithoutException() {
+  void shouldExecuteApplicationWithoutException() {
     assertDoesNotThrow(() -> App.main(new String[]{}));
   }