Show condition run as child for taskrun

[evidolob]

As side effect of this PR, tree load for PipelineRun and it child become more faster,
now we use only PipelineRun data to build subtree for pipelinerun,
previously we fetch TaskRun's for each PipelineRun

Example:

Fix: #277

[sudhirverma]

I am getting an error while starting a condition pipeline

[evidolob]

Current state demo:

@siamaksade I had to introduce new state icon for task in pipelinerun, which indicates that task is pending, and it will show icon for canceled task(we already have it) WDYT?

And another question that with this PR, it is possible to click on 'Open in editor' icon for task, which always throw error until task is not started. As we relay on information provided by pipelinerun json/yaml, which contains all commands, but corresponding TaskRun will not appear until task start running.

[codecov-commenter]

Codecov Report

Merging #292 into master will decrease coverage by 0.67%.
The diff coverage is 43.66%.

@@            Coverage Diff             @@
##           master     #292      +/-   ##
==========================================
- Coverage   74.12%   73.44%   -0.68%     
==========================================
  Files          44       44              
  Lines        3142     3216      +74     
  Branches      565      583      +18     
==========================================
+ Hits         2329     2362      +33     
- Misses        813      854      +41     

Impacted Files	Coverage Δ
src/tekton/tektonitem.ts	86.66% <0.00%> (-4.83%)	⬇️
src/tkn.ts	65.10% <41.86%> (-4.28%)	⬇️
src/pipeline/pipeline-graph.ts	66.37% <50.00%> (+8.79%)	⬆️
src/pipeline/pipelineExplorer.ts	65.90% <100.00%> (+1.62%)	⬆️
src/util/tekton-vfs.ts	96.34% <100.00%> (+0.09%)	⬆️

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[siamaksade]

@evidolob the pending icon looks good, and better representative of that state of pipelinerun. Could we also use a different icon for the condition?

About "Open in Editor", showing and error is fine. The error message should explain that the taskrun is not started yet and user can open it in the editor as soon as it starts running.

[evidolob]

@siamaksade Yes we can, I'm not sure which one to use. As in general condition is also taskrun, and may have same states as regular taskrun.

[evidolob]

I think we can use our icons for other resources(with abbreviation ) and change colors of it depending on state(success/fail/pending/canceled)

[evidolob]

Latest state demo: