id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1318173644,I_kwDOAMm_X85OkbvM,6827,xarray.concat for datasets fails when object is a child class of Dataset,33315687,closed,0,,,6,2022-07-26T12:31:01Z,2023-01-13T17:14:36Z,2023-01-13T17:14:36Z,NONE,,,,"### What happened?

The following error is thrown:

```
>       result = type(datasets[0])(result_vars, attrs=result_attrs)
E       TypeError: __init__() got an unexpected keyword argument 'attrs'
```

This is coming from the change merged as part of this PR: 
https://github.com/pydata/xarray/pull/6784/files (line 593)

When ""datasets"" is a list of class objects which are the child of Dataset, `type(datasets[0])` will return that class as the type. This class however, doesn't necessary has `attrs` in its own init, hence the code breaks. 

I'm not convinced that this is a correct behaviour, and if you want to initialize the Dataset class, you should revert that line of change.

### What did you expect to happen?

Code to run without any errors.

### Minimal Complete Verifiable Example

```Python
import xarray

class MyDataset(xarray.Dataset):
    __slots__ = ()

    def __init__(self, a, b, c, d=None):
        super().__init__()

        attrs = {
            'at1': b,
            'at2': d
        }

        super().__init__(a, coords=c, attrs=attrs)


if __name__ == '__main__':
    a = {
        ""x"": 1,
        ""y"": 3
    }
    b = [""x"", ""y""]
    c = {
        ""coord1"": 0,
        ""coord2"": 1
    }
    ds1 = MyDataset(a, b, c)
    ds2 = MyDataset(a, b, c)
    ds3 = MyDataset(a, b, c)

    xarray.concat([ds1, ds2, ds3], dim=""coord1"")
```


### MVCE confirmation

- [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
- [X] Complete example — the example is self-contained, including all data and the text of any traceback.
- [X] Verifiable example — the example copy & pastes into an IPython prompt or [Binder notebook](https://mybinder.org/v2/gh/pydata/xarray/main?urlpath=lab/tree/doc/examples/blank_template.ipynb), returning the result.
- [X] New issue — a search of GitHub Issues suggests this is not a duplicate.

### Relevant log output

_No response_

### Anything else we need to know?

_No response_

### Environment

xarray==2022.6.0

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