Set the limit of 4 file input in `new.ejs` file

[Suvadip-sana]

Description

Set the limit of 4 file input in new.ejs file from backend as well as front end.

Related Issues

Link any related issues using the format Fixes #issue_number. This helps to automatically close related issues when the PR is merged.

• Placeholder: "Fixes #391 "

Screenshots (if applicable)

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Checklist

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• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] I am working on this issue under GSSOC

@Soujanya2004 Marge it. And don't forget to add all the labels as per ISSUE #391 That is label-3

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[Suvadip-sana]

https://github.com/user-attachments/assets/0a28750b-6ee7-481d-9124-968f426f0b3c