[release-0.13] services: add label app to services to be able to use a labelSelector

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #7371

/assign mimowo

Services: fix the setting of the `app.kubernetes.io/component` label to discriminate between different service components within Kueue as follows:
- controller-manager-metrics-service for kueue-controller-manager-metrics-service 
- visibility-service for kueue-visibility-server
- webhook-service for kueue-webhook-service

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[mimowo]

/kind bug
/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: e112900dde6b07a34fedab2f4870a99ca825e927

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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