Re-introduce resource tests for sidecars

[barchw]

Description
With Istio dropping IstioOperator installed-state from cluster, we need to migrate resource tests that were relying on it to a different solution.
There is no replacement for saving the Istio installation configuration on the cluster, so most likely it is needed to look at the configuration of running pods (for example, deploy httpbin and check sidecar resource config)

We should also think about whether we want to re-introduce tests for egress, as this is not a component we install, and it would require additional setup.

Reference
Originally posted by @barchw in #676 (comment)