remove jaeger envvars

[coryschwartz]

This was causing excessive logging when jaeger wasn't available.

When it is available, you can add these env vars on your own, but usually best to leave them unset.

fixes: #7502

[codecov]

Codecov Report

Merging #7631 (2894567) into master (e196a81) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7631      +/-   ##
==========================================
- Coverage   39.78%   39.70%   -0.08%     
==========================================
  Files         633      633              
  Lines       67258    67258              
==========================================
- Hits        26756    26704      -52     
- Misses      35910    35950      +40     
- Partials     4592     4604      +12     

Impacted Files	Coverage Δ
chain/gen/slashfilter/slashfilter.go	40.00% <0.00%> (-12.00%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-11.77%)	⬇️
extern/sector-storage/manager_calltracker.go	57.70% <0.00%> (-4.85%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
storage/wdpost_changehandler.go	97.64% <0.00%> (-1.89%)	⬇️
itests/kit/blockminer.go	93.65% <0.00%> (-1.59%)	⬇️
lib/rpcenc/reader.go	70.29% <0.00%> (-1.49%)	⬇️
miner/miner.go	57.28% <0.00%> (-1.33%)	⬇️
extern/storage-sealing/fsm.go	55.77% <0.00%> (-1.20%)	⬇️
chain/messagepool/messagepool.go	57.79% <0.00%> (-0.87%)	⬇️
... and 9 more

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