Incremental with `sync_all_columns` passes even if it drops it's partition column

[ccharlesgb]

Steps to Reproduce

Create a partitioned incremental model with on_schema_change='sync_all_columns'

Run dbt and materialise the table

Rename the partition column. The dry run will pass but when running for real you will get the failure:

[base] �[0m11:40:07    Database Error in model my_partitioned_table (models/my_partitioned_table.sql)
[base]   Column `partition_column` cannot be dropped in table `my_partitioned_table`. Columns used in table partitioning or clustering or as part of key constraints cannot be dropped.