Refactor: Unify command menu item execution (#18908)

- Makes engineComponentKey non-nullable on CommandMenuItem. Adds two new
engine component keys: TRIGGER_WORKFLOW_VERSION and
FRONT_COMPONENT_RENDERER to cover the former standalone cases.
- Unifies the previously separated engine, front component and workflow
runners into a single `CommandRunner` component with a unified
`useMountCommand` hook that handles all command types.

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 +1,7 @@
 import { type CommandMenuItemManifest } from 'twenty-shared/application';
 
 import { CommandMenuItemAvailabilityType } from 'src/engine/metadata-modules/command-menu-item/enums/command-menu-item-availability-type.enum';
+import { EngineComponentKey } from 'src/engine/metadata-modules/command-menu-item/enums/engine-component-key.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<
@@ -38,7 +39,7 @@ export const fromCommandMenuItemManifestToUniversalFlatCommandMenuItem = ({
       commandMenuItemManifest.frontComponentUniversalIdentifier,
     availabilityObjectMetadataUniversalIdentifier:
       commandMenuItemManifest.availabilityObjectUniversalIdentifier ?? null,
-    engineComponentKey: null,
+    engineComponentKey: EngineComponentKey.FRONT_COMPONENT_RENDERER,
     hotKeys: null,
     workflowVersionId: null,
     createdAt: now,