refactor: consolidate database query timeout config variables (#18670)

## Summary

- Removes the redundant `DATABASE_STATEMENT_TIMEOUT_MS` config variable
(default 15s) from `ConfigVariables`
- Updates the core TypeORM datasource to use
`PG_DATABASE_PRIMARY_TIMEOUT_MS` (default 10s) for its `query_timeout`,
aligning it with the workspace datasource which already uses this
variable
- This consolidates two separate env vars that controlled the same
concern (database query timeout) into a single one

packages/twenty-server/src/database/typeorm/core/core.datasource.ts

@@ -72,7 +72,7 @@ export const typeORMCoreModuleOptions: TypeOrmModuleOptions = {
         }
       : undefined,
   extra: {
-    query_timeout: Number(process.env.DATABASE_STATEMENT_TIMEOUT_MS ?? 15000),
+    query_timeout: Number(process.env.PG_DATABASE_PRIMARY_TIMEOUT_MS ?? 10000),
   },
 };