Handle errors when imported datafile has null or duplicate id values

[IamEzio]

Fixes #3009

Related to #3026

There was an existing code to handle errors when imported CSV or TSV files had null or duplicate id values. It was not working due to a small mistake. This PR fixes that mistake and replicates that logic for JSON and Excel files.
The logic of the existing code:

When the data imported from the datafile has null or duplicate id values, we rename the column to `id_original` and add another `id` column with default id values.

Screenshots

The video below shows the implementation of the above stated logic for csv, json and excel files.

null_and_duplicate_id.mp4

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• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[IamEzio]

@dmos62 I have added the required tests. PTAL. Thanks!