Activate/Deactivate workflow and Discard Draft (#7022)

## Setup

This PR can be tested only if some feature flags have specific values:

- `IsWorkflowEnabled` equals `true`
- `IsQueryRunnerTwentyORMEnabled` equals `false`

These feature flags weren't committed to don't break other branches.

## What this PR brings

- Display buttons to activate and deactivate a workflow version and a
button to discard the current draft version. I also scaffolded a "Test"
button, which doesn't do anything for now.
- Wired the activate, deactivate and discard draft buttons to the
backend.
- Made it possible to "edit" active and deactivated versions by
automatically creating a new draft version when the user tries to edit
the version.
- Hide the "Discard Draft", button if the current version is not a draft
or is the first version ever created.
- On the backend, don't consider discarded drafts when checking if a new
draft version can be created.
- On the backend, disallow deleting the first created workflow version.
Otherwise, we will end up with a blank canvas in the front end, and it
will be impossible to recover from it.
- On the backend, disallow running deactivation steps if the workflow
version is not currently active. Previously, we were throwing, which is
unnecessary as it's a valid case.

## Spotted bugs that we must dive into

### Duplicate workflow versions in Apollo cache


https://github.com/user-attachments/assets/7cfffd06-11e0-417a-8da0-f9a5f43b84e2

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/modules/activities/tasks/hooks/__tests__/useCompleteTask.test.tsx

@@ -28,20 +28,21 @@ const mocks: MockedResponse[] = [
         mutation UpdateOneTask($idToUpdate: ID!, $input: TaskUpdateInput!) {
           updateTask(id: $idToUpdate, data: $input) {
             __typename
-            status
-            assigneeId
             updatedAt
-            body
             createdAt
+            deletedAt
             dueAt
-            position
             id
-            title
+            status
+            body
             createdBy {
               source
               workspaceMemberId
               name
             }
+            assigneeId
+            position
+            title
           }
         }
       `,
@@ -53,7 +54,7 @@ const mocks: MockedResponse[] = [
     result: jest.fn(() => ({
       data: {
         updateTask: {
-          __typename: 'Activity',
+          __typename: 'Task',
           createdAt: '2024-03-15T07:33:14.212Z',
           reminderAt: null,
           authorId: '123',