Remove legacy vote instructions and vote states

[AshwinSekar]

Problem

With the new TowerSync vote instructions, the following instructions should no longer be sent or consumed through replay and gossip:

• Vote
• VoteSwitch
• UpdateVoteState
• UpdateVoteStateSwitch
• CompactUpdateVoteState
• CompactUpdateVoteStateSwitch

Similarly the following vote states should no longer be supported:

• V0_23_4
• V1_14_11

These instructions and vote states are a maintenance burden and need to be unnecessarily replicated in new clients.

Proposed Solution

• SIMD for vote instructions SIMD-0138: Deprecate legacy vote instructions solana-foundation/solana-improvement-documents#138
• SIMD for vote states
• Add feature flag to stop processing legacy instructions in the vote program
• Add feature flag to stop deserializing legacy vote states in the vote program
• Deprecate Ix and Tx builders
• Deprecate old vote states
• Migrate all tests to TowerSync
• Activate TowerSync feature flag
• Activate feature flag to ignore legacy vote instructions during replay
• Activate feature flag to ignore legacy vote states during deserialization
• Fail to parse legacy vote instructions in gossip
• Remove all deprecated builders
• Remove legacy instruction code
• Remove legacy vote state code