feat: #7747 sealing: Adding conf variable for capping number of concurrent unsealing jobs

[laudiacay]

Related Issues

Closes #7747

Proposed Changes

Will add a variable to cap number of concurrent unsealing jobs so as to prevent overwhelming the miner

Additional Info

See the issue for more details.

Checklist

Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <#issue number> <area>: <change being made>
  • example: fix: #1234 mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs, misc,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green

[codecov]

Codecov Report

Merging #7884 (b9eae2d) into master (3fb71cd) will decrease coverage by 0.03%.
The diff coverage is 84.21%.

@@            Coverage Diff             @@
##           master    #7884      +/-   ##
==========================================
- Coverage   39.38%   39.35%   -0.04%     
==========================================
  Files         655      655              
  Lines       70254    70266      +12     
==========================================
- Hits        27673    27650      -23     
- Misses      37818    37848      +30     
- Partials     4763     4768       +5     

Impacted Files	Coverage Δ
markets/dagstore/miner_api.go	64.21% <82.35%> (+1.11%)	⬆️
node/config/def.go	97.43% <100.00%> (+0.01%)	⬆️
node/modules/storageminer_dagstore.go	61.53% <100.00%> (ø)
markets/loggers/loggers.go	89.28% <0.00%> (-10.72%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
miner/miner.go	55.62% <0.00%> (-3.65%)	⬇️
chain/types/tipset_key.go	85.96% <0.00%> (-3.51%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-1.97%)	⬇️
extern/sector-storage/sched.go	83.12% <0.00%> (-1.65%)	⬇️
chain/store/store.go	63.50% <0.00%> (-1.34%)	⬇️
... and 8 more

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[jennijuju]

Nice!