[Woo POS][Non-Simple Products] For variable product, use attribute name as well as value

[AnirudhBhat]

The goal of this task is to replace Variable product's name (that's just attribute value as of now) with attribute name + value.

Example:
Variable product name: T-shirt
Attribute name: Color
Attribute value: Red, Black

How it's shown now:

1. Red
2. Black

How it should be shown instead:

1. Color: Red
2. Color: Black

[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.