v1.11.x Cleanups

[dhrubabasu]

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

• [ ] getForkHeight()
• [ ] only support new indexing mechanism for p-chain state
  • Will be partially completed via https://github.com/ava-labs/avalanchego/pull/2801
• [ ] Revert #2066
  • Will be completed via https://github.com/ava-labs/avalanchego/pull/2828
• [x] ErrIndexIncomplete + VerifyHeightIndex()
  • Completed via https://github.com/ava-labs/avalanchego/pull/2634
• [x] Remove bootstrapping handling of DAG frontiers
  • Completed via https://github.com/ava-labs/avalanchego/pull/2800
• [x] non-proto encoding
  • Completed via https://github.com/ava-labs/avalanchego/pull/2833
• [x] pruned + ShouldPrune() + PruneAndIndex() + stateBlk + platformvm state initialization + parseStoredBlock()
  • Completed via https://github.com/ava-labs/avalanchego/pull/2825
• [x] Prune()
  • Completed via https://github.com/ava-labs/avalanchego/pull/2829
• [x] Enforce PreferredIDAtHeight in Chits messages
  • Completed via https://github.com/ava-labs/avalanchego/pull/2827
• [x] GetTx
  • Completed via https://github.com/ava-labs/avalanchego/pull/2826
• [x] Use BaseTx instead of CreateSubnetTx in the P-chain wallet
  • Completed via https://github.com/ava-labs/avalanchego/pull/2731
• [x] bitmaskCodec
  • Completed via https://github.com/ava-labs/avalanchego/pull/2792

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