fix: sealer: allow enable/disabling ReplicaUpdate tasks

[arajasek]

backports #8090

[codecov]

Codecov Report

Merging #8093 (75b8e4c) into release/v1.15.0 (095d5d2) will decrease coverage by 0.02%.
The diff coverage is 21.42%.

@@                 Coverage Diff                 @@
##           release/v1.15.0    #8093      +/-   ##
===================================================
- Coverage            39.12%   39.10%   -0.03%     
===================================================
  Files                  662      662              
  Lines                72160    72168       +8     
===================================================
- Hits                 28235    28222      -13     
- Misses               39022    39034      +12     
- Partials              4903     4912       +9     

Impacted Files	Coverage Δ
cmd/lotus-miner/init.go	0.00% <0.00%> (ø)
cmd/lotus-seal-worker/main.go	0.00% <0.00%> (ø)
cmd/lotus-seal-worker/tasks.go	27.27% <ø> (ø)
extern/sector-storage/manager.go	61.85% <100.00%> (+0.14%)	⬆️
node/config/def.go	97.50% <100.00%> (+0.01%)	⬆️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
chain/stmgr/execute.go	86.95% <0.00%> (-4.35%)	⬇️
node/hello/hello.go	63.63% <0.00%> (-3.41%)	⬇️
chain/sub/incoming.go	54.43% <0.00%> (-3.38%)	⬇️
chain/vm/runtime.go	53.17% <0.00%> (-2.12%)	⬇️
... and 17 more

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