fix(chain): skip evicted txs in leftover canonicalization

[noahjoeris]

Description

CanonicalStage::LeftOverTxs doesn't filter evicted txs and can mark them canonical. So a stale-anchored tx that was evicted/replaced could still show as unconfirmed.

Example: a tx confirms, then a reorg leaves only a stale anchor. Leftover treats it as unconfirmed. If it's later RBF'd or missing from the mempool, leftover still marks it unconfirmed.

Changelog notice

• Fix leftover canonicalization to disregard txs with last_evicted >= last_seen.

Checklists

All Submissions:

• I followed the contribution guidelines

Bugfixes:

• This pull request breaks the existing API
• I've added tests to reproduce the issue which are now passing
• I'm linking the issue being fixed by this PR

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.68%. Comparing base (6d03fc3) to head (4f99ffc).

Files with missing lines	Patch %	Lines
crates/chain/src/canonical_task.rs	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2240      +/-   ##
==========================================
+ Coverage   78.65%   78.68%   +0.02%     
==========================================
  Files          30       30              
  Lines        5909     5922      +13     
  Branches      279      281       +2     
==========================================
+ Hits         4648     4660      +12     
- Misses       1185     1186       +1     
  Partials       76       76              

Flag	Coverage Δ
rust	78.68% <92.85%> (+0.02%)	⬆️

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