Add skip-reschedule annotation to skip rescheduling simulation

[EladGabay]

Add a new drainability rule that checks for the annotation cluster-autoscaler.kubernetes.io/skip-reschedule: "true"

Pods with this annotation will:

• Be evictable (can be terminated during scale-down)
• Receive SkipDrain status (not simulated for rescheduling)
• NOT be included in template nodes (unlike daemonset-pod annotation)

Use case: Ephemeral pods that don't need to survive node deletion and don't need destination simulation. The pod will simply be terminated when the node is removed.

This differs from the daemonset-pod annotation which causes pods to be included in template nodes, potentially breaking pod anti-affinity rules during scale-up evaluation.

Ref: #9110

/kind feature

Add skip-reschedule annotation to skip rescheduling simulation

[linux-foundation-easycla]

• ❌ - login: @EladGabay / name: Elad Gabay . The commit (187a802) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[jackfrancis]

going forward we are dropping the year from boilerplate on new source files, CI will be happy if you replace this with Copyright The Kubernetes Authors.

Ref:

• Update license guidance, tooling & templates steering#299

thank you!

[jackfrancis]

/ok-to-test

[jackfrancis]

@EladGabay could you kindly follow the EasyCLA flow and sign the CLA? Thank you!

[jackfrancis]

/release-note-edit

Add skip-reschedule annotation to skip rescheduling simulation