Runner Job Started/Completed Hooks (#1737)

* Prototype for pre job hook

* Remove debug log

* Enable hooks again

* Initialize with hostContext

* Add event_path, fix no-path bug

* Allow script post steps

* Call script handler with correct pre post stage

* Add job completed hook

* Make filecommand work and hardcode shell

* Conditionally print step details and no telemetry for hooks

* Figure out whih script to use

* Only check path for managed scripts

* Resture win dependency

* Nits

* Remove unused, add named params

* Telemetry + refactoring

* add message to job

* rename hooks remove stale comment

* cleanup

* Use .CreateService to create step

* Add L0s

* pr feedback

* update tests

* add disclaimer, clean up code

* spacing fix

* little more cleanup

* pr fix

* pr feedback

* Refactor to use JobExtension

* fix tests

* fix typo

* cleanup code

* more cleanup

* little more cleanup

* last bit of cleanup

* fix tests

* nit fix

* Update src/Runner.Worker/JobHookProvider.cs

Co-authored-by: Edward Thomson <ethomson@github.com>

* don't override runner telemtry

* pr feedback

* pr feedback

* pr feedback

Co-authored-by: Thomas Boop <thboop@github.com>
Co-authored-by: Thomas Boop <52323235+thboop@users.noreply.github.com>
Co-authored-by: Edward Thomson <ethomson@github.com>

src/Runner.Common/Constants.cs

@@ -189,6 +189,12 @@ namespace GitHub.Runner.Common
             public static readonly string Success = "success";
         }
 
+        public static class Hooks
+        {
+            public static readonly string JobStartedStepName = "Set up runner";
+            public static readonly string JobCompletedStepName = "Complete runner";
+        }
+
         public static class Path
         {
             public static readonly string ActionsDirectory = "_actions";