[BUG] Qty input on PDP

[kkumarcodes]

Is your feature request related to a problem? Please describe.
Users can type nonnumber values in qty picker input on PDP.
When validation is triggered it shows a message with regex. Many users can't really understand regex.

Describe the solution you'd like
Qty input should have the type of number and only accept positive numbers.
I would suggest a better validation message that would improve UX.