feat(workflow): route all version content readers through the flag-aware sources (#23583)

## What

Follow-up to #23499. Migrates every remaining reader of
`record.trigger`/`record.steps` so all version content flows through the
flag-aware sources, then removes `trigger`/`steps` from the record field
sets. The record CRUD path no longer carries version content anywhere in
the app.

Reading is still entirely behind `IS_WORKFLOW_VERSION_IN_CORE_ENABLED`:
this PR changes who asks, never where the answer comes from. Flag off
remains record reads (via the content hook's record branch), flag on the
core query.

## Per reader

| reader | now reads |
| --- | --- |
| `WorkflowDiagramCanvasEditable` (connect, drag-stop) | flow atom |
| `useDeleteStep` | flow atom |
| `WorkflowEditActionIfElseBody` (branch cleanup) | flow atom |
| `SidePanelWorkflowCreateStepContent` (parent-step lookup) | flow atom
|
| `SidePanelWorkflowStepInfo` | flow atom (explicit instance id),
falling back to `useWorkflowVersionContent` when the visualizer is not
mounted |
| `TestWorkflowSingleRecordCommand` | `useWorkflowVersionContent`;
`ready` gates on content being loaded |
| headless enrichment hook (imperative) | core content query when the
flag is on, record otherwise |
| `WorkflowRunVisualizerEffect` (step output schemas) | the run snapshot
(`state.flow`), which is what a run should show anyway |

## Field-set slimming

`useWorkflowVersion` and `useWorkflowWithCurrentVersion` stop fetching
`trigger`/`steps` (identity fields only). Three call sites lost their
only reason to call `useWorkflowWithCurrentVersion` and were dropped
entirely. Verified by grep that no `currentVersion.trigger/steps` reads
remain; the only remaining `.trigger`/`.steps` accesses are
argument-taking utils whose callers now pass flow/content-sourced
objects.

## Verification

- `nx typecheck twenty-front` green
- Front tests: 1058 green (the enrichment test gained mocks for the
apollo client and flag its hook now uses)
- Full-tree `oxfmt` + `oxlint --type-aware` green (3 remaining warnings
are pre-existing in unrelated record-field files)
- Live click-through pending, flag off and on

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packages/twenty-front/src/modules/workflow/hooks/useWorkflowWithCurrentVersion.ts

@@ -55,6 +55,14 @@ export const useWorkflowWithCurrentVersion = (
     {
       objectNameSingular: CoreObjectNameSingular.WorkflowVersion,
       objectRecordId: currentVersionId,
+      recordGqlFields: {
+        id: true,
+        name: true,
+        status: true,
+        workflowId: true,
+        createdAt: true,
+        updatedAt: true,
+      },
       skip: !isDefined(currentVersionId),
     },
   );