Fail to add expired precommits to a batch

[arajasek]

Related Issues

#6572

Proposed Changes

The current practice of returning "now" as the cutoff for expired precommits doesn't make sense -- we should just say "it's too late" and fail.

This should send us through the "fail" pipeline into this check, at which point we'll redo PC.

Additional Info

Checklist

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• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
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• CI is green

[codecov]

Codecov Report

Merging #8479 (42a79d5) into master (02a6176) will decrease coverage by 0.01%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master    #8479      +/-   ##
==========================================
- Coverage   40.78%   40.76%   -0.02%     
==========================================
  Files         686      686              
  Lines       75498    75501       +3     
==========================================
- Hits        30789    30778      -11     
- Misses      39406    39413       +7     
- Partials     5303     5310       +7     

Impacted Files	Coverage Δ
extern/storage-sealing/precommit_batch.go	65.90% <57.14%> (-0.38%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-5.89%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
chain/stmgr/searchwait.go	67.30% <0.00%> (-2.57%)	⬇️
chain/events/events_height.go	68.90% <0.00%> (-2.53%)	⬇️
chain/events/observer.go	80.00% <0.00%> (-1.38%)	⬇️
miner/miner.go	56.06% <0.00%> (-1.32%)	⬇️
chain/gen/gen.go	68.19% <0.00%> (-1.23%)	⬇️
extern/sector-storage/sched_worker.go	79.41% <0.00%> (-1.18%)	⬇️
itests/kit/blockminer.go	69.56% <0.00%> (-1.09%)	⬇️
... and 13 more