fix(controller): TestPodExists unit test

[tczhao]

Recent PR #6712 Added TestPodExists

the code is fine, runs well in local machine but somehow in github ci, it fails very often
#6753 https://github.com/argoproj/argo-workflows/runs/3632323865?check_suite_focus=true
#6749 https://github.com/argoproj/argo-workflows/runs/3627112929?check_suite_focus=true

I tested using

	assert.Equal(t, "hello-world", pod.Name)
	assert.Equal(t, "hello-world", pod.ObjectMeta.Name)
	assert.Equal(t, pod.Name, pod.ObjectMeta.Name)

They indeed show the same value in github CI

but using woc.podExists(pod.Name) just fails

changing to woc.podExists(pod.ObjectMeta.Name) seems to solve the issue

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[codecov]

Codecov Report

Merging #6763 (41e8236) into master (7684ef4) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 41e8236 differs from pull request most recent head deba156. Consider uploading reports for the commit deba156 to get more accurate results

@@            Coverage Diff             @@
##           master    #6763      +/-   ##
==========================================
- Coverage   48.64%   48.60%   -0.04%     
==========================================
  Files         264      264              
  Lines       19076    19076              
==========================================
- Hits         9279     9272       -7     
- Misses       8752     8762      +10     
+ Partials     1045     1042       -3     

Impacted Files	Coverage Δ
server/workflow/workflow_server.go	44.41% <0.00%> (-2.40%)	⬇️
workflow/metrics/server.go	19.29% <0.00%> (+3.50%)	⬆️

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