Certificate handling with k3d

[skoeva]

For authentication with k3d in the CI, we need to handle certificates properly in the kubeconfig to avoid failures in the playwright tests. Without modifying the certificates, the failures look like this:

When we incorrectly handle the certificates, we get a failure that looks like this:

We are unable to test this locally due to #1914, so we are left to test changes in the CI. Ideally, it seems we should be able to modify the kubeconfig to handle certificates appropriately to avoid both of these errors in the playwright tests.