Add clarification comments for action test setup

Author: sameagen-MW

src/test/java/unit/com/mathworks/ci/actions/RunMatlabBuildActionTest.java

@@ -44,6 +44,7 @@ public class RunMatlabBuildActionTest {
     private boolean setup = false;
     private RunMatlabBuildAction action;
 
+    // Not using @BeforeClass to avoid static fields.
     @Before
     public void init() {
         if (!setup) {

src/test/java/unit/com/mathworks/ci/actions/RunMatlabCommandActionTest.java

@@ -33,6 +33,7 @@ public class RunMatlabCommandActionTest {
     private boolean setup = false;
     private RunMatlabCommandAction action;
 
+    // Not using @BeforeClass to avoid static fields.
     @Before
     public void init() {
         if (!setup) {

src/test/java/unit/com/mathworks/ci/actions/RunMatlabTestsActionTest.java

@@ -40,6 +40,7 @@ public class RunMatlabTestsActionTest {
     private boolean setup = false;
     private RunMatlabTestsAction action;
 
+    // Not using @BeforeClass to avoid static fields.
     @Before
     public void init() throws IOException, InterruptedException {
         if (!setup) {