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/testing/mock-data/metadata.ts

@@ -5,7 +5,7 @@ import {
   ObjectEdge,
   ObjectMetadataItemsQuery,
 } from '~/generated-metadata/graphql';
-import { mockedStandardObjectMetadataQueryResult } from '~/testing/mock-data/generated/standard-metadata-query-result';
+import { mockedStandardObjectMetadataQueryResult } from '~/testing/mock-data/generated/mock-metadata-query-result';
 
 // TODO: replace with new mock
 const customObjectMetadataItemEdge: ObjectEdge = {

packages/twenty-front/src/testing/mock-data/objectMetadataItems.ts

@@ -1,5 +1,5 @@
 import { ObjectMetadataItem } from '@/object-metadata/types/ObjectMetadataItem';
-import { mockedStandardObjectMetadataQueryResult } from '~/testing/mock-data/generated/standard-metadata-query-result';
+import { mockedStandardObjectMetadataQueryResult } from '~/testing/mock-data/generated/mock-metadata-query-result';
 
 export const generatedMockObjectMetadataItems: ObjectMetadataItem[] =
   mockedStandardObjectMetadataQueryResult.objects.edges.map((edge) => ({