Rotate animation for sync button while syncing repos

[mecuricat]

Is your feature request related to a problem? Please describe. When you click the Sync repositories button on top right corner, there is no visible acknowledgement that the repos are indeed syncing.

Describe the solution you'd like Rotate animation for the sync button while repos are syncing.

https://user-images.githubusercontent.com/112750975/235223366-090bbff3-ba2e-4770-a15f-8b2f87e34a81.mp4

Additional context The illustration is from Read You.