Set the image upload limit of 4 for edit form

[Suvadip-sana]

Description

Set the image upload limit of 4 for edit form. Both frontend and backend.

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 #392 "

Screenshots (if applicable)

Add any screenshots that help explain or visualize the changes.

https://github.com/user-attachments/assets/69656332-ac31-45d9-86c5-5df9d596d92c

Checklist

Make sure to check off all the items before submitting. Mark with [x] if done.

• [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 #392

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