Composite Actions: Support Env Flow (#557)

* Composite Action Run Steps

* Env Flow => Able to get env variables and overwrite current env variables => but it doesn't 'stick'

* clean up

* Clean up trace messages + add Trace debug in ActionManager

* Add debugging message

* Optimize runtime of code

* Change String to string

* Add comma to Composite

* Change JobSteps to a List, Change Register Step function name

* Add TODO, remove unn. content

* Remove unnecessary code

* Fix unit tests

* Fix env format

* Remove comment

* Remove TODO message for context

* Add verbose trace logs which are only viewable by devs

* Sort usings in Composite Action Handler

* Change 0 to location

* Update context variables in composite action yaml

* Add helpful error message for null steps

* Fix Workflow Step Env overiding Parent Env

* Remove env in composite action scope

* Clean up

* Revert back

* revert back

* add back envToken

* Remove unnecessary code

* Figure out how to handle set-env edge cases

* formatting

* fix unit tests

* Fix windows unit test syntax error

src/Runner.Worker/Handlers/CompositeActionHandler.cs

@@ -84,10 +84,8 @@ namespace GitHub.Runner.Worker.Handlers
                 actionRunner.Stage = stage;
                 actionRunner.Condition = aStep.Condition;
                 actionRunner.DisplayName = aStep.DisplayName;
-                // TODO: Do we need to add any context data from the job message?
-                // (See JobExtension.cs ~line 236)
 
-                ExecutionContext.RegisterNestedStep(actionRunner, inputsData, location);
+                ExecutionContext.RegisterNestedStep(actionRunner, inputsData, location, Environment);
                 location++;
             }