Rework types for logic function (#18074)

## Summary

- **Consolidate logic function services**: Remove
`LogicFunctionMetadataService` and consolidate all logic function CRUD
operations into `LogicFunctionFromSourceService`, with a new
`LogicFunctionFromSourceHelperService` for shared validation/migration
logic
- **Introduce typed conversion utils following the skill pattern**: Add
`fromCreateLogicFunctionFromSourceInputToUniversalFlatLogicFunctionToCreate`
and `fromUpdateLogicFunctionFromSourceInputToFlatLogicFunctionToUpdate`
that convert DTO inputs directly to flat entities
(`UniversalFlatLogicFunction` / `FlatLogicFunction`), replacing the
previous intermediate `UpdateLogicFunctionMetadataParams` indirection
- **Simplify `CodeStepBuildService`**: Remove ~100 lines of manual
duplication logic by delegating to
`LogicFunctionFromSourceService.duplicateOneWithSource`
- **Remove completed 1-17 migration**: Delete
`MigrateWorkflowCodeStepsCommand` and associated utils that migrated
workflow code steps from serverless functions to logic functions

packages/twenty-server/src/modules/workflow/workflow-tools/tools/update-logic-function-source.tool.ts

@@ -50,10 +50,12 @@ To find the logicFunctionId, look at the code step's settings.input.logicFunctio
       const { logicFunctionId, code } = parameters;
       const { workspaceId } = context;
 
-      await deps.logicFunctionFromSourceService.updateOne({
-        id: logicFunctionId,
-        update: {
-          sourceHandlerCode: code,
+      await deps.logicFunctionFromSourceService.updateOneFromSource({
+        updateLogicFunctionFromSourceInput: {
+          id: logicFunctionId,
+          update: {
+            sourceHandlerCode: code,
+          },
         },
         workspaceId,
       });