fix: Make task/step name extractor robust

[simster7]

Fixes #5600

[codecov]

Codecov Report

Merging #5672 (6b599fd) into master (ded95bc) will increase coverage by 0.07%.
The diff coverage is 100.00%.

❗ Current head 6b599fd differs from pull request most recent head d520ea1. Consider uploading reports for the commit d520ea1 to get more accurate results

@@            Coverage Diff             @@
##           master    #5672      +/-   ##
==========================================
+ Coverage   47.05%   47.13%   +0.07%     
==========================================
  Files         240      240              
  Lines       15049    15060      +11     
==========================================
+ Hits         7082     7098      +16     
+ Misses       7062     7057       -5     
  Partials      905      905              

Impacted Files	Coverage Δ
workflow/controller/operator.go	71.11% <100.00%> (+0.44%)	⬆️
cmd/argoexec/commands/emissary.go	48.43% <0.00%> (-1.57%)	⬇️
cmd/argo/commands/get.go	56.95% <0.00%> (+0.64%)	⬆️

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