Add 'when' to diagram

[evidolob]

Fix: #416

Demo:

[evidolob]

@siamaksade Can you look on screen?

[codecov-io]

Codecov Report

Merging #431 into master will increase coverage by 0.19%.
The diff coverage is 83.96%.

@@            Coverage Diff             @@
##           master     #431      +/-   ##
==========================================
+ Coverage   74.42%   74.62%   +0.19%     
==========================================
  Files          61       61              
  Lines        3922     4008      +86     
  Branches      714      734      +20     
==========================================
+ Hits         2919     2991      +72     
- Misses       1003     1017      +14     

Impacted Files	Coverage Δ
src/model/pipeline/pipeline-model.ts	77.66% <50.00%> (-3.00%)	⬇️
src/pipeline/pipeline-graph.ts	75.65% <80.00%> (-0.46%)	⬇️
src/yaml-support/tkn-yaml.ts	90.55% <97.18%> (+1.01%)	⬆️
src/model/common.ts	93.00% <100.00%> (+0.09%)	⬆️
src/tekton/addtrigger.ts	82.67% <0.00%> (+2.36%)	⬆️

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