Update UID in changelog generation

Updated the UID field in the changelog generation script from "changelog" to "changelog.full". This change ensures uniqueness and prevents potential conflicts in the document UID within the docfx build.

Author: AndreyAkinshin

build/Program.cs

@@ -498,7 +498,7 @@ public override void Run(BuildContext context)
         context.Information("DocfxChangelogGenerate: full.md");
         var fullContent = new StringBuilder();
         fullContent.AppendLine("---");
-        fullContent.AppendLine("uid: changelog");
+        fullContent.AppendLine("uid: changelog.full");
         fullContent.AppendLine("---");
         fullContent.AppendLine("");
         fullContent.AppendLine("# Full ChangeLog");