feat: Identifiable user agents in various Argo commands

[terrytangyuan]

Signed-off-by: terrytangyuan terrytangyuan@gmail.com

Checklist:

• My organization is added to USERS.md.

[codecov]

Codecov Report

Merging #5624 (f595a5f) into master (c941ef8) will increase coverage by 0.07%.
The diff coverage is 44.44%.

❗ Current head f595a5f differs from pull request most recent head ff9d5da. Consider uploading reports for the commit ff9d5da to get more accurate results

@@            Coverage Diff             @@
##           master    #5624      +/-   ##
==========================================
+ Coverage   47.00%   47.07%   +0.07%     
==========================================
  Files         240      240              
  Lines       15002    15034      +32     
==========================================
+ Hits         7052     7078      +26     
- Misses       7053     7056       +3     
- Partials      897      900       +3     

Impacted Files	Coverage Δ
cmd/argo/commands/client/conn.go	13.33% <0.00%> (-0.63%)	⬇️
cmd/argo/commands/server.go	33.91% <0.00%> (-0.61%)	⬇️
cmd/argoexec/commands/root.go	1.69% <0.00%> (ø)
workflow/artifacts/oss/oss.go	7.89% <0.00%> (-0.33%)	⬇️
workflow/executor/resource.go	22.94% <0.00%> (-0.70%)	⬇️
cmd/argo/commands/get.go	56.31% <41.66%> (-0.36%)	⬇️
workflow/artifacts/git/git.go	40.21% <85.71%> (+3.43%)	⬆️
pkg/apis/workflow/v1alpha1/workflow_types.go	46.04% <100.00%> (+0.25%)	⬆️
workflow/controller/operator.go	71.17% <100.00%> (+0.21%)	⬆️
... and 2 more

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