[Visual Testing]: Implement visual tests of KButton

[AlexVelezLl]

Product

KDS.

Desired behavior

After #685, we ended up with a very straightforward way of writting visual tests. Now lets implement exhaustive tests for one component - KButton, and test the whole visual tests process with this component.

We should take the snapshot of the different visual combinations of KButton:

• KButton as primary raised button
• KButton as primary flat button
• KButton as secondary raised button
• KButton as secondary flat button
• KButton as basic link
• KButton as raised button disabled
• KButton as flat button disabled
• KButton as raised button with hover state
• KButton as flat button with hover state
• KButton with icon and afterIcon
• KButton with default slot

Current behavior

Currently we just have the basic example with default props.

[KshitijThareja]

Hi @AlexVelezLl
Thanks for creating the issue. I'll try to create a PR for this soon :)

[AlexVelezLl]

Thank you @KshitijThareja!

[AlexVelezLl]

Closed by #710.