Add `project` filtering argument to the `scaling_groups` strawberry GQL resolver

## Motivation

- The `scaling_groups` query currently only supports filtering by `name` and `is_active`, and does not allow filtering by project. Adding this is necessary to maintain existing functionality

JIRA Issue: BA-3183

Locate the Strawberry GraphQL `scaling_groups` resolver and read how its existing `name` and `is_active` filters are defined. Add support for filtering by `project`, then verify that the `scaling_groups` query returns only groups matching the requested project.

Written by the indexing model from the issue text.