Fix readonly in some steps (#10121)

- readonly in titles
- readonly in code step
- update a few icons
- update event label

packages/twenty-front/src/modules/workflow/workflow-diagram/utils/__tests__/getWorkflowVersionDiagram.test.ts

@@ -74,7 +74,7 @@ describe('getWorkflowVersionDiagram', () => {
   "nodes": [
     {
       "data": {
-        "icon": "IconPlus",
+        "icon": "IconPlaylistAdd",
         "isLeafNode": false,
         "name": "Record is created",
         "nodeType": "trigger",
@@ -143,7 +143,7 @@ describe('getWorkflowVersionDiagram', () => {
   "nodes": [
     {
       "data": {
-        "icon": "IconPlus",
+        "icon": "IconPlaylistAdd",
         "isLeafNode": false,
         "name": "Company created",
         "nodeType": "trigger",