fix(core/txpool/legacypool): reset gauges on clear #33654

[gzliudan]

Proposed changes

Ref: ethereum#33654

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
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[Copilot]

Pull request overview

This PR fixes txpool metrics consistency by ensuring all transaction-count gauges are reset when LegacyPool.Clear() wipes the pool’s internal state. This aligns observed metrics with the cleared in-memory pool contents (useful for tests and any non-production invocations of Clear).

Changes:

• Reset txpool/pending, txpool/queued, and txpool/slots gauges to 0 during LegacyPool.Clear().
• Keep existing account-count gauge resets (txpool/pending/accounts, txpool/queued/accounts) alongside the new resets.

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[Copilot]

The new behavior of resetting pendingGauge/queuedGauge/slotsGauge in Clear isn’t covered by tests. Since metrics correctness is the purpose of this fix, consider adding a small unit test that sets these gauges to non-zero values, calls pool.Clear(), and asserts they are reset to 0 (alongside the existing pool state assertions).