Move getSchemaName to util (#13357)

## Context
The method was very simple and deterministic, I'm moving its logic to a
util so we don't have to import a service to use it.

packages/twenty-server/src/engine/workspace-datasource/utils/get-workspace-schema-name.util.ts

@@ -0,0 +1,5 @@
+import { uuidToBase36 } from 'twenty-shared/utils';
+
+export const getWorkspaceSchemaName = (workspaceId: string): string => {
+  return `workspace_${uuidToBase36(workspaceId)}`;
+};