[BUG]: Mapping of Calibrate operator is stuck in "Please wait..." indefinitely

[liunelson]

Describe the bug

Molly from MITRE reported this bug and I was able to reproduce it in their project on Prod.
https://app.terarium.ai/projects/15e6144e-d8ac-4438-b9e4-a6704ef5a41c/workflow/9f4dec9a-088b-4443-bf4c-daa4bbf799e7

The "Mapping" section of the Calibrate operator is either incredibly slow or stuck indefinitely in "Please wait...".
This happens with Dataset 1 but not Dataset 2. It's likely because of the size of Dataset 1 (~10 MB or >10,000 rows).

Dataset 1: https://drive.google.com/file/d/1L8uGgNzo2KEqk_IvXgwXtShEICVD_Ww8/view?usp=drive_link
Dataset 2: https://drive.google.com/file/d/1HghnPA0_ET8qeCiM_DxylMPj9P4VouC5/view?usp=drive_link

To Reproduce
Steps to reproduce the behavior:

1. Upload any model and select some default configuration
2. Upload Datasets 1 and 2
3. Connect each to a Calibrate model operator
4. See that "Mapping" of the operator connected to Dataset 1 is stuck

Expected behaviour

The operator might be trying to load the entire dataset when it only needs to read the first row to get the column headers.
It might also be doing this before loading the model and reading its state variables and observables.
In any case, the usage of a large dataset shouldn't be bogged down already at the calibration settings step.

Screenshots

Additional context
Add any other context about the problem here.