v1.11.x Cleanups

[dhrubabasu]

This issue tracks all code cleanups that can be done post v1.11 activation.

• only support new indexing mechanism for p-chain state
  • Will be partially completed via Remove fallback validator height indexing #2801
• getForkHeight()
  • Completed via [vms/proposervm] Remove getForkHeight() #2929
• ErrIndexIncomplete + VerifyHeightIndex()
  • Completed via Remove verify height index #2634
• Remove bootstrapping handling of DAG frontiers
  • Completed via Remove engine type handling for everything other than GetAncestors #2800
• non-proto encoding
  • Completed via Remove legacy p2p message handling #2833
• pruned + ShouldPrune() + PruneAndIndex() + stateBlk + platformvm state initialization + parseStoredBlock()
  • Completed via [vms/platformvm] Remove state pruning logic #2825
• Prune()
  • Completed via [vms/avm] Remove state pruning logic #2829
• Enforce PreferredIDAtHeight in Chits messages
  • Completed via [snow/networking] Enforce PreferredIDAtHeight in Chits messages #2827
• GetTx
  • Completed via [vms/avm] Cleanup GetTx + remove state pruning logic #2826
• Use BaseTx instead of CreateSubnetTx in the P-chain wallet
  • Completed via Use BaseTx in P-chain wallet #2731
• bitmaskCodec
  • Completed via Remove bitmaskCodec #2792

[github-actions]

This issue has become stale because it has been open 60 days with no activity. Adding the lifecycle/frozen label will cause this issue to ignore lifecycle events.