Incomplete data model validation: an array is accepted as `time_dimension` in a pre-aggregation definition

[igorlukanin]

Describe the bug
In YAML-based data models, an array is accepted for the time_dimension parameter in a pre-aggregation definition. This data model compiles but fails at runtime, when the query comes.

Changing the time dimension definition to the following fixes it:

        time_dimension: CUBE.x_order_created_at

To Reproduce
Steps to reproduce the behavior:

1. Use the following data model.
2. Run a query.

{
  "dimensions": [
    "orders_yml.x_merchant_name"
  ],
  "timeDimensions": [],
  "order": {
    "orders_yml.x_merchant_name": "asc"
  }
}

3. See the error.

Typename.split is not a function
TypeError: name.split is not a function
    at CubeStoreQuery.aliasName (/cube/node_modules/@cubejs-backend/schema-compiler/src/adapter/BaseQuery.js:2205:23)
    at BaseTimeDimension.unescapedAliasName (/cube/node_modules/@cubejs-backend/schema-compiler/src/adapter/BaseTimeDimension.ts:63:26)
    at /cube/node_modules/@cubejs-backend/schema-compiler/src/adapter/PreAggregations.js:1340:53
    at _map (/cube/node_modules/@cubejs-backend/schema-compiler/node_modules/ramda/src/internal/_map.js:7:19)
...

Expected behavior
This data model should fail at compile time with a clear error message.

Minimally reproducible Cube Schema

cubes:
  - name: orders_yml
    data_source: my_analytics
    sql_table: public.my_orders

    dimensions:

      - name: x_merchant_name
        sql: x_merchant_name
        type: string

      - name: x_order_created_at
        sql: x_created_at
        type: time
    
    pre_aggregations:
      - name: orders_rollup
        type: rollup
        dimensions:
          - CUBE.x_merchant_name
        time_dimension:
          - CUBE.x_order_created_at
        granularity: day

Version:
v1.1.16

Additional context
Reported by Embeddable in Slack: https://cube-js.slack.com/archives/C04KDTE2EF7/p1737652938177579

[igorlukanin]

Discussed with @KSDaemon: this is actually quite tricky to fix. Since this is not a big deal, we can probably live with this.