refactor: Remove the need for pod annotations to be mounted as a volume !!POC!!

[alexec]

See #5946

[codecov]

Codecov Report

Merging #5950 (72797b4) into master (3cfc96b) will increase coverage by 0.28%.
The diff coverage is 35.21%.

@@            Coverage Diff             @@
##           master    #5950      +/-   ##
==========================================
+ Coverage   47.35%   47.63%   +0.28%     
==========================================
  Files         248      248              
  Lines       15663    15485     -178     
==========================================
- Hits         7417     7377      -40     
+ Misses       7316     7187     -129     
+ Partials      930      921       -9     

Impacted Files	Coverage Δ
cmd/argoexec/commands/root.go	1.49% <0.00%> (-0.05%)	⬇️
workflow/common/common.go	100.00% <ø> (ø)
workflow/controller/controller.go	19.42% <0.00%> (-0.41%)	⬇️
workflow/controller/pod_cleanup_key.go	20.00% <ø> (ø)
workflow/executor/executor.go	19.64% <0.00%> (+3.48%)	⬆️
workflow/executor/resource.go	26.66% <ø> (+1.37%)	⬆️
workflow/controller/exec_control.go	58.13% <37.50%> (+5.50%)	⬆️
workflow/controller/operator.go	70.33% <91.66%> (-0.34%)	⬇️
workflow/controller/dag.go	72.67% <100.00%> (ø)
workflow/controller/steps.go	72.30% <100.00%> (ø)
... and 4 more

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