How to categorize this issue?

/area testing
/kind flake

Which test(s)/suite(s) are flaking:
E2E tests for extensions which use the KinD setup can sometimes flake during the step which deploys the extensions' charts in the local KinD cluster.

CI link:

• https://prow.gardener.cloud/view/gs/gardener-prow/pr-logs/pull/gardener_gardener-extension-shoot-rsyslog-relp/34/pull-gardener-extension-shoot-rsyslog-relp-e2e-kind/1723972989701066752
• https://prow.gardener.cloud/view/gs/gardener-prow/pr-logs/pull/gardener_gardener-extension-shoot-rsyslog-relp/38/pull-gardener-extension-shoot-rsyslog-relp-e2e-kind/1731974321494036480

Reason for failure:
This can happen if the extensions' charts contain a clusterrole resource. E.g. the shoot-rsyslog-relp extension deploys a ClusterRole as part of the skaffold deployment for the shoot-rsyslog-relp-admission used for the e2e tests.

This skaffold deployment can fail with the following error:

Error: INSTALLATION FAILED: 1 error occurred:
	* Internal error occurred: failed calling webhook "clusterrole-machine-controller-manager.local.extensions.gardener.cloud": failed to call webhook: Post "[https://gardener-extension-provider-local.extension-provider-local-5mf8n.svc:443/clusterrole-machine-controller-manager?timeout=5s](https://gardener-extension-provider-local.extension-provider-local-5mf8n.svc/clusterrole-machine-controller-manager?timeout=5s)": dial tcp 10.2.126.230:443: connect: connection refused

The reason for the failure is that the gardener-extension-provider-local pods could get evicted by VPA during the deployment of the extension charts, meaning that the gardener-extension-provider-locals webhook server will be temporarily unavailable.

The clusterrole-machine-controller-manager.local.extensions.gardener.cloud webhook does not have any selectors:

Therefore, anything that tries to deploy a ClusterRole while the gardener-extension-provider-local pods are down will fail.

Anything else we need to know: