feat: permanent EigenPod retirement and emissions burn

[elhajin]

Motivation:

Native restakers cannot leave EigenLayer without fully exiting validators from the beacon chain, which is slow and costly in lost rewards. EIP-7251 allows consolidating stake to external validators without exiting, but EigenPods block that while restaked. This release adds permanent pod retirement and also adds an emissions burn path.

Modifications:

• Add EigenPodManager.disablePod() and DelegationManager.clearQueuedWithdrawalsForDisabledPod() so native restakers can permanently retire a pod after all beacon shares are queued and no longer slashable.
• Disabled pods stop restaking accounting, allow owner-only consolidation/exit to external validators, and let the pod owner sweep remaining ETH via withdrawDisabledPodETH.
• Add Burn distribution type to EmissionsController to unwrap and permanently burn a weighted emissions allotment.
• Add unit/integration coverage and v1.14.0 upgrade scripts for DelegationManager, EigenPodManager, EigenPod, and EmissionsController.

Result:

Native restakers can retire their pod and move validator stake externally without a full beacon-chain exit. The incentive council can permanently burn part of EIGEN emissions each epoch. Ships as the v1.14.0 core upgrade.