Make the section header more descriptive

Instead of just using the task name as section header, use "Executing task TASKNAME".
This makes the section headers more consistent with the section headers used by GitLab CI which uses e.g. "Executing "step_script" stage of the job script"

Author: ap0llo

src/Cake.GitLabCI.Module/GitLabCIEngine.cs

@@ -45,17 +45,17 @@ public GitLabCIEngine(ICakeDataService dataService, ICakeLog log, IConsole conso
 
         private void OnBeforeSetup(object sender, BeforeSetupEventArgs e)
         {
-            WriteSectionStart("Setup");
+            WriteSectionStart("setup", "Executing Setup");
         }
 
         private void OnAfterSetup(object sender, AfterSetupEventArgs e)
         {
-            WriteSectionEnd("Setup");
+            WriteSectionEnd("setup");
         }
 
         private void OnBeforeTaskSetup(object sender, BeforeTaskSetupEventArgs e)
         {
-            WriteSectionStart(GetSectionNameForTask(e.TaskSetupContext.Task.Name), e.TaskSetupContext.Task.Name);
+            WriteSectionStart(GetSectionNameForTask(e.TaskSetupContext.Task.Name), $"Executing task \"{e.TaskSetupContext.Task.Name}\"");
         }
 
         private void OnAfterTaskTeardown(object sender, AfterTaskTeardownEventArgs e)
@@ -65,17 +65,17 @@ private void OnAfterTaskTeardown(object sender, AfterTaskTeardownEventArgs e)
 
         private void OnBeforeTeardown(object sender, BeforeTeardownEventArgs e)
         {
-            WriteSectionStart("Teardown");
+            WriteSectionStart("teardown", "Executing Teardown");
         }
 
         private void OnAfterTeardown(object sender, AfterTeardownEventArgs e)
         {
-            WriteSectionEnd("Teardown");
+            WriteSectionEnd("teardown");
         }
 
-        private void WriteSectionStart(string sectionName, string sectionHeader = null)
+        private void WriteSectionStart(string sectionName, string sectionHeader)
         {
-            _console.WriteLine("{0}", $"{AnsiEscapeCodes.SectionMarker}section_start:{DateTimeOffset.UtcNow.ToUnixTimeSeconds()}:{sectionName}\r{AnsiEscapeCodes.SectionMarker}{AnsiEscapeCodes.ForegroundBlue}{sectionHeader ?? sectionName}{AnsiEscapeCodes.Reset}");
+            _console.WriteLine("{0}", $"{AnsiEscapeCodes.SectionMarker}section_start:{DateTimeOffset.UtcNow.ToUnixTimeSeconds()}:{sectionName}\r{AnsiEscapeCodes.SectionMarker}{AnsiEscapeCodes.ForegroundBlue}{sectionHeader}{AnsiEscapeCodes.Reset}");
         }
 
         private void WriteSectionEnd(string sectionName)