Fix lifecycle compatibility guidance

Correct high-confidence Business Central guidance and samples for upgrade tags, collectible errors, trigger semantics, obsoletion, events, interfaces, API contracts, and test transactions.

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

Copilot-Session: e05a43e7-6448-4d67-9c73-798523f5d945

microsoft/knowledge/events/use-ishandled-to-make-base-behaviour-overridable.good.al

@@ -7,6 +7,7 @@ codeunit 50220 "Shipping Charge Good Sample"
     begin
         // Give extensions a sanctioned seam to replace the calculation, then
         // skip the default logic when a subscriber has handled it.
+        IsHandled := false;
         OnBeforeCalculateShippingCharge(OrderAmount, Charge, IsHandled);
         if IsHandled then
             exit(Charge);