feat(miner): remove batch balancer-related functionality

[tediou5]

关联的Issues (Related Issues)

close #1108

改动 (Proposed Changes)

Removed BatchCommitAboveBaseFee and the related checks; It is now always batching.

附注 (Additional Info)

自查清单 (Checklist)

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• 符合 Venus 项目管理规范中关于 PR 的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• 具有清晰明确的 commit message / All commits have a clear commit message.
• 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
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