Colorize the GitLab CI section header

Highlight the section header in the GitLab CI log to make it easier to differentiate between the section header and the log output inside the section

Author: ap0llo

src/Cake.GitLabCI.Module/AnsiEscapeCodes.cs

@@ -7,6 +7,7 @@ internal static class AnsiEscapeCodes
         public static readonly string ForegroundYellow = string.Format(FORMAT, 33);
         public static readonly string ForegroundLightGray = string.Format(FORMAT, 37);
         public static readonly string ForegroundDarkGray = string.Format(FORMAT, 90);
+        public static readonly string ForegroundBlue = string.Format(FORMAT, 34);
         public static readonly string BackgroundMagenta = string.Format(FORMAT, 45);
         public static readonly string BackgroundRed = string.Format(FORMAT, 41);
         public static readonly string SectionMarker = "\u001B[0K";

src/Cake.GitLabCI.Module/GitLabCIEngine.cs

@@ -75,7 +75,7 @@ private void OnAfterTeardown(object sender, AfterTeardownEventArgs e)
 
         private void WriteSectionStart(string sectionName, string sectionHeader = null)
         {
-            _console.WriteLine("{0}", $"{AnsiEscapeCodes.SectionMarker}section_start:{DateTimeOffset.UtcNow.ToUnixTimeSeconds()}:{sectionName}\r{AnsiEscapeCodes.SectionMarker}{sectionHeader ?? sectionName}");
+            _console.WriteLine("{0}", $"{AnsiEscapeCodes.SectionMarker}section_start:{DateTimeOffset.UtcNow.ToUnixTimeSeconds()}:{sectionName}\r{AnsiEscapeCodes.SectionMarker}{AnsiEscapeCodes.ForegroundBlue}{sectionHeader ?? sectionName}{AnsiEscapeCodes.Reset}");
         }
 
         private void WriteSectionEnd(string sectionName)