feat(ui): wider stroke width for selected node. Fixes #6984

[tczhao]

Fixes #6984

Untitled_.Oct.21.2021.mp4

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[codecov]

Codecov Report

Merging #7000 (b2e6395) into master (0446f52) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7000      +/-   ##
==========================================
+ Coverage   48.48%   48.53%   +0.04%     
==========================================
  Files         265      265              
  Lines       19273    19273              
==========================================
+ Hits         9345     9354       +9     
+ Misses       8876     8865      -11     
- Partials     1052     1054       +2     

Impacted Files	Coverage Δ
cmd/argo/commands/get.go	58.30% <0.00%> (-1.46%)	⬇️
workflow/controller/operator.go	71.22% <0.00%> (+0.14%)	⬆️
cmd/argoexec/commands/emissary.go	51.79% <0.00%> (+1.43%)	⬆️
server/workflow/workflow_server.go	46.80% <0.00%> (+2.39%)	⬆️

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