fix(admin-ui): Make sku optional in create-product-variant-dialog

[Dominic-Preap]

Description

fix(admin-ui): make sku optional in create-product-variant-dialog

• SKU field should be optional when create new product variant inside Manage variants #2999

Breaking changes

N/A

Screenshots

N/A

Checklist

📌 Always:

• I have set a clear title
• My PR is small and contains a single feature
• I have checked my own PR

👍 Most of the time:

• I have added or updated test cases
• I have updated the README if needed

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Aug 10, 2024 0:48am

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[Dominic-Preap]

I have read the CLA Document and I hereby sign the CLA

[michaelbromley]

Thank you!