feat(poll): use getCheckTxInPool if available

[davidyuk]

depends on #1362
closes #1260

[codecov]

Codecov Report

Merging #1375 (690db5b) into develop (955fe13) will decrease coverage by 0.09%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop    #1375      +/-   ##
===========================================
- Coverage    88.18%   88.09%   -0.10%     
===========================================
  Files           56       56              
  Lines         3098     3099       +1     
  Branches        39       40       +1     
===========================================
- Hits          2732     2730       -2     
- Misses         345      348       +3     
  Partials        21       21              

Impacted Files	Coverage Δ
src/utils/errors.ts	67.76% <0.00%> (-0.89%)	⬇️
src/chain/node.js	91.66% <50.00%> (-1.80%)	⬇️
src/node.js	96.77% <100.00%> (ø)
src/utils/swagger.js	97.77% <100.00%> (-0.05%)	⬇️
src/channel/handlers.js	78.97% <0.00%> (+0.60%)	⬆️

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