Promote performance knowledge from community to Microsoft layer

Pure git-mv relocation of all 7 performance articles from community/knowledge/performance/ to microsoft/knowledge/performance/. No content changes.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/performance/load-only-primary-key-fields-for-reference-work.bad.al

@@ -0,0 +1,18 @@
+codeunit 50100 "Item Reindex Queue"
+{
+    procedure QueueItemsForReindex(CategoryCode: Code[20])
+    var
+        Item: Record Item;
+        ReindexQueue: Codeunit "Reindex Queue";
+    begin
+        // Default full-record load. Description, Unit Price, Inventory, and
+        // every other column are fetched across the wire and held in memory
+        // for the whole loop - the body only ever reads "No.".
+        Item.SetRange("Item Category Code", CategoryCode);
+
+        if Item.FindSet() then
+            repeat
+                ReindexQueue.Enqueue(Item."No.");
+            until Item.Next() = 0;
+    end;
+}