Prevent using vso commands with Build.SourceVersionAuthor variable (#5184)

Co-authored-by: Slava Irkhin <[email protected]>

Author: sirkhin

src/Agent.Worker/Variables.cs

@@ -270,6 +270,7 @@ public bool Retain_Default_Encoding
         {
             Constants.Variables.Build.SourceVersionMessage,
             Constants.Variables.Build.DefinitionName,
+            Constants.Variables.Build.SourceVersionAuthor,
             Constants.Variables.System.SourceVersionMessage,
             Constants.Variables.System.DefinitionName,
             Constants.Variables.System.JobDisplayName,

src/Microsoft.VisualStudio.Services.Agent/Constants.cs

@@ -427,6 +427,7 @@ public static class Build
                 public static readonly string SourceBranch = "build.sourcebranch";
                 public static readonly string SourceTfvcShelveset = "build.sourcetfvcshelveset";
                 public static readonly string SourceVersion = "build.sourceversion";
+                public static readonly string SourceVersionAuthor = "build.sourceversionauthor";
                 public static readonly string SourceVersionMessage = "build.sourceVersionMessage";
                 public static readonly string SourcesDirectory = "build.sourcesdirectory";
                 public static readonly string StagingDirectory = "build.stagingdirectory";
@@ -621,6 +622,7 @@ public static class Task
                 Build.SourceBranch,
                 Build.SourceTfvcShelveset,
                 Build.SourceVersion,
+                Build.SourceVersionAuthor,
                 Build.SourceVersionMessage,
                 Build.SourcesDirectory,
                 Build.StagingDirectory,

src/Test/L0/Worker/WorkerL0.cs

@@ -241,6 +241,7 @@ public void VerifyJobRequestMessageVsoCommandsDeactivated()
             message.Variables[Constants.Variables.System.DefinitionName] = "##vso[setVariable]etc4";
             message.Variables[Constants.Variables.Release.ReleaseDefinitionName] = "##vso[setVariable]etc5";
             message.Variables[Constants.Variables.Release.ReleaseEnvironmentName] = "##vso[setVariable]etc6";
+            message.Variables[Constants.Variables.Build.SourceVersionAuthor] = "##vso[setVariable]etc7";
 
             var scrubbedMessage = WorkerUtilities.DeactivateVsoCommandsFromJobMessageVariables(message);
 
@@ -250,6 +251,7 @@ public void VerifyJobRequestMessageVsoCommandsDeactivated()
             Assert.Equal("**vso[setVariable]etc4", scrubbedMessage.Variables[Constants.Variables.System.DefinitionName]);
             Assert.Equal("**vso[setVariable]etc5", scrubbedMessage.Variables[Constants.Variables.Release.ReleaseDefinitionName]);
             Assert.Equal("**vso[setVariable]etc6", scrubbedMessage.Variables[Constants.Variables.Release.ReleaseEnvironmentName]);
+            Assert.Equal("**vso[setVariable]etc7", scrubbedMessage.Variables[Constants.Variables.Build.SourceVersionAuthor]);
         }
 
         [Fact]