This adds 2 new tests covering EndpointSlices, including new coverage of
the self referential Endpoints and EndpointSlices that need to be
created by the API Server and the lifecycle of EndpointSlices from
creation to deletion. This also removes the [feature] indicator from the
name to ensure that this test will run more often now that it is enabled
by default.
Since EndpointSlices and Endpoints are expected to be enabled by default
for some time, it's important to have tests covering the functionality
of both controllers. With some consumers relying on Endpoints and others
relying on EndpointSlices, it's important to ensure both resources are
generated in a timely manner with consistent attributes.
