test: disable flaky TestBatchDealInput

[Stebalien]

See #4611.

[Stebalien]

Now we see just how much code coverage we lose.

[codecov]

Codecov Report

Merging #7176 (1105c24) into master (b509f1f) will increase coverage by 4.60%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7176      +/-   ##
==========================================
+ Coverage   30.17%   34.78%   +4.60%     
==========================================
  Files         678      685       +7     
  Lines       79767    80152     +385     
==========================================
+ Hits        24069    27880    +3811     
+ Misses      50393    46603    -3790     
- Partials     5305     5669     +364     

Impacted Files	Coverage Δ
storage/wdpost_sched.go	77.22% <0.00%> (-3.97%)	⬇️
extern/storage-sealing/precommit_batch.go	72.82% <0.00%> (-2.06%)	⬇️
itests/kit/deals.go	87.80% <0.00%> (-1.22%)	⬇️
extern/storage-sealing/commit_batch.go	69.13% <0.00%> (-1.19%)	⬇️
node/impl/storminer.go	22.50% <0.00%> (-1.00%)	⬇️
extern/storage-sealing/fsm.go	58.23% <0.00%> (-0.81%)	⬇️
extern/storage-sealing/input.go	58.39% <0.00%> (-0.77%)	⬇️
extern/sector-storage/sched_worker.go	77.25% <0.00%> (-0.73%)	⬇️
chain/types/mock/chain.go	86.66% <0.00%> (ø)
conformance/chaos/gen/gen.go	0.00% <0.00%> (ø)
... and 154 more

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