Use staged rollout for updates

[Nokel81]

What would you like to be added: The ability to slowly roll out updates so that not all users will see an update immediately. When a new release is created it should be (by default) rolled out to 0% of users.

The percentage of users that an update is rolled out to MUST be configurable outside of this repo.

Why is this needed: This should be able to help limit the blast radius of bad updates and should help smooth out spikes of downloading the updates.

Environment you are Lens application on:

• Kubernetes distribution: [EKS, AKS, GKE, Rancher, ...]
• Desktop OS: <the OS Lens app runs on in your case>