Feature: Implement "Add a Variant" Button

[Emmadegreat]

Description

GitHub Issue: Implement "Add a Variant" Button on the Edit Product Details Page #1377

Closes #issue_number_here

Changes proposed

What were you told to do?

The "Add a Variant" button is visible on the product details page. Clicking the button adds a new row to the stock management table.

Implement "Add a Variant" Button on the Edit Product Details Page #1377

What did you do?

I implemented the variant button, that allows users to seamlesly add product to the product management table. The Button is well place and visible to users.

Screenshort is attached below.

Check List (Check all the applicable boxes)

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• [ ] My code follows the code style of this project.
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• [ ] The title and description of the PR is clear and explains the approach.
• [ ] I am making a pull request against the dev branch (left side).
• [ ] My commit messages styles matches our requested structure.
• [ ] My code additions will fail neither code linting checks nor unit test.
• [ ] I am only making changes to files I was requested to.

Screenshots/Videos

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	14.55%	785 / 5393
🔵	Statements	14.24%	787 / 5525
🔵	Functions	14%	215 / 1535
🔵	Branches	9.86%	230 / 2331

File Coverage

No changed files found.

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