Use 'kubectl' to list taskrun for pipeline

[evidolob]

Fix: #91

[codecov-io]

Codecov Report

Merging #281 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
+ Coverage   69.86%   69.88%   +0.02%     
==========================================
  Files          42       42              
  Lines        3106     3105       -1     
  Branches      570      568       -2     
==========================================
  Hits         2170     2170              
+ Misses        936      935       -1     

Impacted Files	Coverage Δ
src/extension.ts	87.15% <100.00%> (ø)
src/tekton/taskrun.ts	100.00% <100.00%> (ø)
src/tkn.ts	69.27% <100.00%> (+0.06%)	⬆️

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