Run kubernetes autodiscover E2E tests in CI

[jsoriano]

Changes in the main kubernetes-related packages should trigger autodiscover E2E tests in CI. These tests were added in elastic/e2e-testing#1064

Main packages related to this feature are:

./libbeat/autodiscover
./metricbeat/autodiscover
./heartbeat/autodiscover
./filebeat/autodiscover
./x-pack/libbeat/autodiscover
./libbeat/common/kubernetes

More generally this would be:

./*/autodiscover
./x-pack/*/autodiscover
./libbeat/common/kubernetes

For agent we should also add the kubernetes provider, but there are no E2E test cases yet (elastic/e2e-testing#1090).

./x-pack/elastic-agent/pkg/composable/providers/kubernetes

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[faec]

Looks like this was already completed in the linked issues and PRs a few days later :-)