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/api/mcp/services/__tests__/mcp-protocol.service.spec.ts

@@ -156,7 +156,9 @@ describe('McpProtocolService', () => {
     });
 
     it('should throw when role ID is missing', async () => {
-      userRoleService.getRoleIdForUserWorkspace.mockResolvedValue(undefined);
+      userRoleService.getRoleIdForUserWorkspace.mockResolvedValue(
+        undefined as unknown as string,
+      );
 
       await expect(
         service.getRoleId('workspace-1', 'user-workspace-1'),