[BUG] validate the duplicate column in the result dataset of query defined KPI

[manassolanki]

Describe the bug

If there is any custom query joining multiple tables with the same table name and we are defining the duplicate column name in the metric, datetime or dimension column, then the code isn't uniquely able to identify the column in the result dataset.

Current behavior

Deepdrill and anomaly are having errors because of this.

Expected behavior

We should add the KPI validation while someone is adding the KPI for handling this use case.

Logs

If possible, please share the relevant logs.