docs(executor): emissary executor also runs on GKE autopilot

[Bobgy]

Update based on #5434 (comment)

Checklist:

• My organization is added to USERS.md.

Tips:

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• Sign-off your commits to pass the DCO check: git commit --signoff.
• Run make pre-commit -B to fix codegen or lint problems.
• Say how how you tested your changes. If you changed the UI, attach screenshots.

[codecov]

Codecov Report

Merging #6430 (bc12284) into master (96b165e) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6430      +/-   ##
==========================================
+ Coverage   48.74%   48.75%   +0.01%     
==========================================
  Files         253      253              
  Lines       18217    18217              
==========================================
+ Hits         8880     8882       +2     
  Misses       8367     8367              
+ Partials      970      968       -2     

Impacted Files	Coverage Δ
workflow/metrics/server.go	15.78% <0.00%> (-3.51%)	⬇️
cmd/argo/commands/get.go	60.34% <0.00%> (+0.58%)	⬆️
cmd/argoexec/commands/emissary.go	51.79% <0.00%> (+1.43%)	⬆️

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