Merge branch 'improvement/SetValue-no-update' into release/5.1.0

If calling `TrackedRecordCollection<>.SetValue()` without any updates—i.e., an existing record is present, but the `Value` hasn't changed, and neither `markDirty` nor `version` are specified—then return without further processing. In that case, there's no need to create a new instance of the record, to potentially call the property on the corresponding `Topic`, or to store the new record in the collection. This is a minor performance enhancement.

Author: JeremyCaney

OnTopic/Collections/Specialized/TrackedRecordCollection{TItem,TValue,TAttribute}.cs

@@ -461,6 +461,9 @@ internal void SetValue(
         else if (originalItem.Value != value) {
           markAsDirty = true;
         }
+        else if (!version.HasValue) {
+          return;
+        }
         updatedItem             = originalItem with {
           Value                 = value,
           IsDirty               = markAsDirty,