feat: worker: check fd limit on startup

[magik6k]

Related Issues

Closes #8387

Proposed Changes

Additional Info

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>: <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
• 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 #8390 (5a42083) into master (a709a0a) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #8390      +/-   ##
==========================================
- Coverage   40.67%   40.58%   -0.09%     
==========================================
  Files         686      686              
  Lines       75262    75270       +8     
==========================================
- Hits        30613    30551      -62     
- Misses      39363    39412      +49     
- Partials     5286     5307      +21     

Impacted Files	Coverage Δ
cmd/lotus-worker/main.go	0.00% <0.00%> (ø)
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
chain/exchange/client.go	52.96% <0.00%> (-8.48%)	⬇️
blockstore/api.go	24.00% <0.00%> (-8.00%)	⬇️
chain/stmgr/call.go	65.94% <0.00%> (-6.49%)	⬇️
storage/wdpost_sched.go	81.37% <0.00%> (-5.89%)	⬇️
chain/events/events_called.go	83.90% <0.00%> (-4.40%)	⬇️
extern/storage-sealing/currentdealinfo.go	71.17% <0.00%> (-3.61%)	⬇️
chain/events/state/predicates.go	53.09% <0.00%> (-2.07%)	⬇️
chain/actors/builtin/market/v7.go	45.16% <0.00%> (-1.62%)	⬇️
... and 13 more