S3 snapshots are not being selected in S3-enabled RKE2/K3s downstream clusters

[markusewalker]

Issue Description

When performing any of the snapshot tests with an S3-enabled RKE2/K3s cluster, I am consistently seeing the following issue: s3 is enabled for the cluster, but selected snapshot is not from s3. This is not seen in RKE1. It appears the issue is that it is grabbing local snapshots each time and not S3 snapshots.

This is a release blocker and prevents us from using S3 in our testing.

[markusewalker]

2.10 PR merged, keeping open so that we can be sure to merge the backports once code freeze is over.