Add local only cache to cache service and cache typeorm entity metadata (#16287)

## Problem

buildEntityMetadatas in GlobalWorkspaceOrmManager is computationally
expensive and was running on every executeInWorkspaceContext call. This
method uses
TypeORM's EntitySchemaTransformer and EntityMetadataBuilder to build
metadata for all workspace entities (30-50+ objects with many fields
each).

The resulting EntityMetadata[] is not serialisable which means it cannot
be cached in Redis because they contain:
- Circular references
- Functions/methods
- References to the DataSource instance

## Solution

Extended the workspace cache system to support local-only caching, then
created a cache provider for entityMetadatas.

## Implementation details
Updated @WorkspaceCache decorator (workspace-cache.decorator.ts)
- Added localOnly?: boolean option to skip Redis storage for
non-serializable data
Created WorkspaceEntityMetadatasCacheService
- Computes entity metadatas from DB to avoid race condition, this is
acceptable
Simplified GlobalWorkspaceOrmManager
- Now fetches entityMetadatas from cache instead of rebuilding on every
call
Updated Workspace migration runner - the only entry point where metadata
can change
- Now invalidate the new 'entityMetadata' local cache when
shouldIncrementMetadataGraphqlSchemaVersion is true (== field/object
mutations)

packages/twenty-server/src/engine/metadata-modules/user-role/user-role.service.ts

@@ -63,18 +63,23 @@ export class UserRoleService {
     userWorkspaceId,
   }: {
     workspaceId: string;
-    userWorkspaceId?: string;
-  }): Promise<string | undefined> {
-    if (!isDefined(userWorkspaceId)) {
-      return;
-    }
-
+    userWorkspaceId: string;
+  }): Promise<string> {
     const { userWorkspaceRoleMap } =
       await this.workspaceCacheService.getOrRecompute(workspaceId, [
         'userWorkspaceRoleMap',
       ]);
 
-    return userWorkspaceRoleMap[userWorkspaceId];
+    const roleId = userWorkspaceRoleMap[userWorkspaceId];
+
+    if (!isDefined(roleId)) {
+      throw new PermissionsException(
+        `User workspace ${userWorkspaceId} has no role assigned`,
+        PermissionsExceptionCode.NO_ROLE_FOUND_FOR_USER_WORKSPACE,
+      );
+    }
+
+    return roleId;
   }
 
   public async getRolesByUserWorkspaces({