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GH-41923: [C++] Fix ExecuteScalar deduce all_scalar with chunked_array (#41925)



### Rationale for this change

ExecBatch says it's a `array` or `scalar` for execution, however, it could contains the `chunked_array` in some cases. The `is_scalar` in `compute` is wrong when input contains `chunked_array`.

### What changes are included in this PR?

Fix `is_scalar` in compute

### Are these changes tested?

Yes

### Are there any user-facing changes?

bugfix

* GitHub Issue: #41923

Lead-authored-by: mwish <maplewish117@gmail.com>
Co-authored-by: mwish <anmmscs_maple@qq.com>
Signed-off-by: mwish <maplewish117@gmail.com>