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/workflow/hooks/useActivateWorkflowVersion.tsx

@@ -0,0 +1,45 @@
+import { useApolloMetadataClient } from '@/object-metadata/hooks/useApolloMetadataClient';
+import { ApolloClient, useApolloClient, useMutation } from '@apollo/client';
+
+import { CoreObjectNameSingular } from '@/object-metadata/types/CoreObjectNameSingular';
+import { useFindOneRecordQuery } from '@/object-record/hooks/useFindOneRecordQuery';
+import { ACTIVATE_WORKFLOW_VERSION } from '@/workflow/graphql/activateWorkflowVersion';
+import {
+  ActivateWorkflowVersionMutation,
+  ActivateWorkflowVersionMutationVariables,
+} from '~/generated/graphql';
+
+export const useActivateWorkflowVersion = () => {
+  const apolloClient = useApolloClient();
+
+  const apolloMetadataClient = useApolloMetadataClient();
+  const [mutate] = useMutation<
+    ActivateWorkflowVersionMutation,
+    ActivateWorkflowVersionMutationVariables
+  >(ACTIVATE_WORKFLOW_VERSION, {
+    client: apolloMetadataClient ?? ({} as ApolloClient<any>),
+  });
+
+  const { findOneRecordQuery: findOneWorkflowVersionQuery } =
+    useFindOneRecordQuery({
+      objectNameSingular: CoreObjectNameSingular.WorkflowVersion,
+    });
+
+  const activateWorkflowVersion = async (workflowVersionId: string) => {
+    await mutate({
+      variables: {
+        workflowVersionId,
+      },
+    });
+
+    await apolloClient.query({
+      query: findOneWorkflowVersionQuery,
+      variables: {
+        objectRecordId: workflowVersionId,
+      },
+      fetchPolicy: 'network-only',
+    });
+  };
+
+  return { activateWorkflowVersion };
+};