merge strategy not working for Delta

### Describe the bug
A simple upsert to a DeltaLake model is failing.
Cause:
1. source dataset is materialized as a temporary view
2. merge statement is referencing source dataset prepending schema

### Steps To Reproduce
A simple incremental delta model is enough to reproduce:
```
- name: delta_model
config:
materialized: incremental
incremental_strategy: merge
file_format: delta
unique_key: 'id'
columns:
- name: id
- name: val
```

### Expected behavior
Model run succeeds and delta table is updated succesfully

### Screenshots and log output
Output from `dbt run --debug`:

source generation query
```sql
create or replace temporary view delta_model_tmp as with source_data as (
select 1 as id, 10 as val
union all
select 3 as id, 5 as val
)

select *
from source_data
```

merge query
```sql
merge into dbt_glue_sc631266_db.delta_model as DBT_INTERNAL_DEST
using dbt_glue_sc631266_db.delta_model_tmp as DBT_INTERNAL_SOURCE
on
DBT_INTERNAL_SOURCE.id = DBT_INTERNAL_DEST.id

when matched then update set
*

when not matched then insert (id, val) values (DBT_INTERNAL_SOURCE.id, DBT_INTERNAL_SOURCE.val)
```

### System information
**The output of `dbt --version`:**
```
Core:
- installed: 1.10.13
- latest: 1.10.13 - Up to date!

Plugins:
- athena: 1.9.4 - Update available!
- spark: 1.9.3 - Up to date!
- glue: 1.10.11 - Up to date!
- duckdb: 1.9.6 - Up to date!
```

**The operating system you're using:**

**The output of `python --version`:**
Python 3.11.11
### Additional context
Add any other context about the problem here.

Start by reproducing the incremental Delta model with the shown dbt configuration and inspect the merge SQL from dbt run --debug. Trace the adapter's temporary-view generation and merge entry point; done means the merge references the temporary view correctly and the model run updates the Delta table successfully.

Written by the indexing model from the issue text.