feat(workflow): add core workflow entity (syncable) + create-table (#22746)

## Core `workflow` entity (syncable)

Part of the app-workflows work. Adds a core `WorkflowEntity extends
SyncableEntity` (`name`, `lastPublishedVersionId`, plus
`universalIdentifier`/`applicationId`/workspace from the base class) and
its 2.20 create-table fast command, gated with
`@WasIntroducedInUpgrade`.

Schema was captured and verified via `migrate:generate` (zero drift,
FK/index hashes correct), then run against a live DB.

Backfill (populate from workspace `workflow` records) and the dual-write
listener land in follow-ups.

Independent of the version-syncable-columns PR, but note: both add 2.20
upgrade commands, so this one (ts `…479`) must merge **before** the
version PR (ts `…480`) to satisfy the append-only guard.


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packages/twenty-server/src/engine/core-modules/workflow/entities/workflow.entity.ts

@@ -0,0 +1,35 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  Index,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+import { CREATE_WORKFLOW_CORE_TABLE_UPGRADE_COMMAND_NAME } from 'src/database/commands/upgrade-version-command/2-20/create-workflow-core-table-upgrade-command-name.constant';
+import { WasIntroducedInUpgrade } from 'src/engine/core-modules/upgrade/decorators/was-introduced-in-upgrade.decorator';
+import { SyncableEntity } from 'src/engine/workspace-manager/types/syncable-entity.interface';
+
+@Entity({ name: 'workflow', schema: 'core' })
+@WasIntroducedInUpgrade({
+  upgradeCommandName: CREATE_WORKFLOW_CORE_TABLE_UPGRADE_COMMAND_NAME,
+})
+@Index('IDX_WORKFLOW_WORKSPACE_ID', ['workspaceId'])
+@Index('IDX_WORKFLOW_APPLICATION_ID', ['applicationId'])
+export class WorkflowEntity extends SyncableEntity {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ type: 'text', nullable: true })
+  name: string | null;
+
+  @Column({ type: 'uuid', nullable: true })
+  lastPublishedVersionId: string | null;
+
+  @CreateDateColumn({ type: 'timestamptz' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ type: 'timestamptz' })
+  updatedAt: Date;
+}