Edge Agent: Remove unused plan runner and planner (Azure#6444)

Removing unused planner and plan runner inside Edge Agent. Passing CI:
https://dev.azure.com/msazure/One/_build/results?buildId=56572707&view=results


## Azure IoT Edge PR checklist:

edge-agent/src/Microsoft.Azure.Devices.Edge.Agent.Core/AgentEventIds.cs

@@ -6,8 +6,6 @@ public struct AgentEventIds
         public const int Agent = EventIdStart;
         public const int FileConfigSource = EventIdStart + 100;
         public const int TwinConfigSource = EventIdStart + 200;
-        public const int RestartPlanner = EventIdStart + 300;
-        public const int OrderedPlanRunner = EventIdStart + 400;
         public const int DeploymentFileBackup = EventIdStart + 500;
         public const int HealthRestartPlanner = EventIdStart + 600;
         public const int RestartManager = EventIdStart + 700;

edge-agent/test/Microsoft.Azure.Devices.Edge.Agent.Core.Test/AgentTests.cs

@@ -20,6 +20,9 @@ namespace Microsoft.Azure.Devices.Edge.Agent.Core.Test
     [Unit]
     public class AgentTests
     {
+        const int CoolOffTimeInSeconds = 10;
+        const int MaxRunCount = 20;
+
         public static IEnumerable<object[]> GetExceptionsToTest() => new List<object[]>
         {
             new object[]
@@ -387,7 +390,7 @@ public async void ReconcileAsyncOnSetPlan()
             var mockConfigSource = new Mock<IConfigSource>();
             var mockEnvironment = new Mock<IEnvironment>();
             var mockPlanner = new Mock<IPlanner>();
-            var planRunner = new OrderedPlanRunner();
+            var planRunner = new OrderedRetryPlanRunner(MaxRunCount, CoolOffTimeInSeconds, new SystemTime());
             var mockReporter = new Mock<IReporter>();
             var mockModuleIdentityLifecycleManager = new Mock<IModuleIdentityLifecycleManager>();
             var configStore = Mock.Of<IEntityStore<string, string>>();
@@ -436,7 +439,7 @@ public async void ReconcileAsyncWithNoDeploymentChange()
             var mockConfigSource = new Mock<IConfigSource>();
             var mockEnvironment = new Mock<IEnvironment>();
             var mockPlanner = new Mock<IPlanner>();
-            var planRunner = new OrderedPlanRunner();
+            var planRunner = new OrderedRetryPlanRunner(MaxRunCount, CoolOffTimeInSeconds, new SystemTime());
             var mockReporter = new Mock<IReporter>();
             var mockModuleIdentityLifecycleManager = new Mock<IModuleIdentityLifecycleManager>();
             var configStore = Mock.Of<IEntityStore<string, string>>();