Qt6 Migration: Merge latest Qt5 devel content and apply migration fixes

- Merged 292 changed files from dlbo snapshot
- Fixed IDL enum collisions (PortType, PdmEventType)
- Fixed Grantlee template for C++11 scoped enums
- Fixed CMake VERSION_GREATER syntax
- Added missing directories (THP, LtsRestClient, etc.)

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

Lts/Tools/RestClientUi/rest_templates/01_itemsKeys.json

@@ -0,0 +1,5 @@
+{
+  "name": "itemsKeys",
+  "method": "GET",
+  "endpoint": "/uncat/itemsKeys"
+}