feat(workflow): scaffold core workflowVersion entity + trigger cache (phase 0) (#21674)

## What

**Phase 0 (scaffold)** of migrating `workflowVersion` data to **core**.
Gated by `IS_WORKFLOW_VERSION_IN_CORE_ENABLED` with **no behavior
change** — nothing reads or writes the new core entity yet.

## Plan

`workflowVersion` becomes a thin **workspace shell** over a core entity
(the `dashboard`/`pageLayout` pattern), so navigation, the metadata
relations, and the record UI keep working while the heavy data
(`triggers`, `steps`) lives in core. Trigger dispatch will derive from
active core versions via a per-workspace cache, letting us **eliminate**
the denormalized `workflowAutomatedTrigger` object. `workflow` and
`workflowRun` stay as workspace objects.

Phases: **0 — scaffold (this PR)** → A — backfill + dual-write → B —
switch reads to core → C — drop the workspace `trigger`/`steps` columns
+ the `workflowAutomatedTrigger` object.

## Included
- **Core `WorkflowVersionEntity`** (`extends WorkspaceRelatedEntity`) —
stores version data, with triggers as an **array** (`triggers:
WorkflowTrigger[]`), a long-due shape change. Storage only: dispatch
reads the primary trigger, so behavior stays single-trigger for now.
- **Fast create-table instance command** for `core."workflowVersion"`
(v2.19.0).
- **`IS_WORKFLOW_VERSION_IN_CORE_ENABLED`** feature flag.
- **Per-workspace automated-trigger cache provider** deriving
CRON/DATABASE_EVENT dispatch from the active version's trigger —
groundwork for removing `workflowAutomatedTrigger`.

## Notes
- `WorkspaceRelatedEntity`, **not** `SyncableEntity`: this is user
runtime data (like `connectedAccount`/`apiKey`/`file`), not
application-manifest metadata.
- No frontend behavior; the generated `FeatureFlagKey` enums are updated
to include the new flag.

packages/twenty-server/src/engine/workspace-cache/types/workspace-cache-key.type.ts

@@ -10,6 +10,7 @@ import { type ApplicationVariableCacheMaps } from 'src/engine/core-modules/appli
 import { type FlatApplicationCacheMaps } from 'src/engine/core-modules/application/types/flat-application-cache-maps.type';
 import { type CurrentBillingSubscription } from 'src/engine/core-modules/billing/types/flat-billing-subscription.type';
 import { type FlatWorkspaceMemberMaps } from 'src/engine/core-modules/user/types/flat-workspace-member-maps.type';
+import { type WorkflowAutomatedTriggerMaps } from 'src/engine/core-modules/workflow/types/workflow-automated-trigger-maps.type';
 import { type FlatRoleTargetByAgentIdMaps } from 'src/engine/metadata-modules/flat-agent/types/flat-role-target-by-agent-id-maps.type';
 import { type AllFlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/types/all-flat-entity-maps.type';
 import { type UserWorkspaceRoleMap } from 'src/engine/metadata-modules/role-target/types/user-workspace-role-map';
@@ -62,6 +63,7 @@ export const WORKSPACE_CACHE_KEYS_V2 = {
   applicationVariableMaps: 'cache:application-variable',
   graphQLResolverNameMap: 'direct-execution:graphql-resolver-name-map',
   currentBillingSubscription: 'billing:subscription',
+  workflowAutomatedTriggerMaps: 'cache:workflow-automated-trigger',
 } as const satisfies Record<WorkspaceCacheKeyName, string>;
 
 export type AdditionalCacheDataMaps = {
@@ -79,6 +81,7 @@ export type AdditionalCacheDataMaps = {
   applicationVariableMaps: ApplicationVariableCacheMaps;
   graphQLResolverNameMap: Record<string, ResolverNameMapEntry>;
   currentBillingSubscription: CurrentBillingSubscription;
+  workflowAutomatedTriggerMaps: WorkflowAutomatedTriggerMaps;
 };
 
 export type WorkspaceCacheDataMap = AllFlatEntityMaps<true> &