[Enhancement]: Accepting files of incorrect formats instead of rejecting them

[Harshit28j]

Description:

Currently, when submitting to EvalAI, the system is accepting files of incorrect formats instead of rejecting them. This can cause issues with the evaluation process

Steps to reproduce:

Go to the submission page for a challenge on EvalAI
Attempt to submit a file of a format that is not accepted by the challenge (e.g. an image file for a challenge that requires a CSV file)
Observe that the system accepts the file and allows the submission to proceed

Expected behavior:

The system should reject files of incorrect formats and display an error message to the user, indicating that the file format is not accepted.

[Stazz0]

Hello, @Harshit28j To address the issue of accepting incorrect file formats, I suggest implementing a file validation mechanism on either server-side or client-side so that only the correct file format is submitted.