[COMMAND MENU ITEMS] Add engine component key (#18554)

## PR Description

In the process of migrating all the existing commands to the backend, we
stumbled across a couple of problems that made us reconsider the full
migration. This PR introduces a way for command menu items to bypass
front components and to directly reference a frontend component from
twenty front.

It:
- Introduces a `engineFrontComponentKey` field on `CommandMenuItem` as
an alternative to `frontComponentId` and `workflowVersionId`, allowing
command menu items to reference frontend components by key directly
rather than requiring a FrontComponent entity
- Updates the DB constraint to allow exactly one of `workflowVersionId`,
`frontComponentId`, or `engineFrontComponentKey`

### All standard command menu items from the frontend which use
`standardFrontComponentKey`

These are all commands that execute a GraphQL query or a mutation.
Two mains concerned have been raised that made us go with this
(temporary) architecture instead:
- If those commands are part of the standard application, they can only
alter objects from that application and not custom objects.
- We would need to implement a way to trigger optimistic rendering from
the front components, which might take some time to implement.

List:
- Create new record
- Delete (single record)
- Delete records (multiple)
- Restore record
- Restore records (multiple)
- Permanently destroy record
- Permanently destroy records (multiple)
- Add to favorites
- Remove from favorites
- Merge records
- Duplicate Dashboard
- Save Dashboard
- Save Page Layout
- Activate Workflow
- Deactivate Workflow
- Discard Draft (workflow)
- Test Workflow
- Tidy up workflow
- Duplicate Workflow
- Stop (workflow run)
- Use as draft (workflow version)

---------

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

packages/twenty-server/src/engine/core-modules/application/application-manifest/converters/from-command-menu-item-manifest-to-universal-flat-command-menu-item.util.ts

@@ -1,6 +1,6 @@
 import { type CommandMenuItemManifest } from 'twenty-shared/application';
 
-import { CommandMenuItemAvailabilityType } from 'src/engine/metadata-modules/command-menu-item/entities/command-menu-item.entity';
+import { CommandMenuItemAvailabilityType } from 'src/engine/metadata-modules/command-menu-item/enums/command-menu-item-availability-type.enum';
 import { type UniversalFlatCommandMenuItem } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-command-menu-item.type';
 
 const AVAILABILITY_TYPE_MAP: Record<
@@ -38,6 +38,7 @@ export const fromCommandMenuItemManifestToUniversalFlatCommandMenuItem = ({
       commandMenuItemManifest.frontComponentUniversalIdentifier,
     availabilityObjectMetadataUniversalIdentifier:
       commandMenuItemManifest.availabilityObjectUniversalIdentifier ?? null,
+    engineComponentKey: null,
     workflowVersionId: null,
     createdAt: now,
     updatedAt: now,