Negative Commission Rates Accepted

Describe the bug
An issue has been identified in the Multivendor Admin Dashboard where the commission rates for vendors are accepting negative values.

To Reproduce
Steps to reproduce the behavior:

Log in to the Multivendor Admin Dashboard.
Navigate to the section where commission rates for vendors are configured.
Attempt to set a negative value for the commission rate.
Expected behavior
The system should prevent users from entering or saving negative values for commission rates, as negative rates are not valid in this context.

Screenshots
https://github.com/ninjas-code-official/food-delivery-multivendor/assets/152266796/1cbcd911-8f36-43bc-8de1-8498ea3b5a78

Desktop:

Browser: chrome

Start at the Multivendor Admin Dashboard section where vendor commission rates are configured and reproduce the issue by entering a negative value. Trace the commission-rate form validation and save flow. Done means negative rates are rejected both during entry or validation and when saving, with an appropriate regression test if the project has coverage for this form.

Written by the indexing model from the issue text.