aio app delete service does not fully update .env

The command updates `.aio` but it does not remove the service scope from the `..._meta__scopes` environment variable in `.env`.

### Example

```
_meta__scopes=["asset_compute_meta","ent_audiencemanagerplatform_sdk","ent_places_sdk"]
```

*User removes Asset Compute Service*
```
_meta__scopes=["asset_compute_meta","ent_audiencemanagerplatform_sdk","ent_places_sdk"]
```

The `"asset_compute_meta"` value above should be removed.

Start with the `aio app delete service` command and trace the code that updates `.aio` and `.env`. Reproduce the Asset Compute Service removal using the example scope list, then verify that the service scope is removed from the `..._meta__scopes` environment variable as well as from `.aio`.

Written by the indexing model from the issue text.