Missing support for kubernetes 1.34 native preStop.sleep

[schildwaechter]

Describe the bug
We switched from using lifecycle.preStop.exec to sleep in a shell to using the native lifecycle.preStop.sleep that became GA in Kubernetes 1.34.

But robusta shows this as

• RobustaDeployment.spec.template.spec.containers[0].lifecycle.preStop.exec: ExecAction(command=['sleep', '10']) ➡️ None

To Reproduce
Steps to reproduce the behavior:

1. Run Kubernetes 1.34
2. Have a deployment with

    lifecycle:
      preStop:
        exec:
          command:
            - sleep
            - "10"

3. Change to

    lifecycle:
      preStop:
        sleep:
          seconds: 10

4. See the message in your notification channel

Expected behavior
See something like

• RobustaDeployment.spec.template.spec.containers[0].lifecycle.preStop: exec: ExecAction(command=['sleep', '10']) ➡️ sleep: seconds: 10

[naomi-robusta]

Fixed in #2057