fix: cleanup argocd unknown flag errors (#8625)

[danielhelfand]

Closes #8625

This pull request makes errors from unknown flags easier to locate and removes a duplicate display of the error message.

Not sure if there are further considerations around removing the print of the error from main.go, but this can definitely be amended to make this skipping of the additional error print specific to the argocd cli.

Signed-off-by: Daniel Helfand helfand.4@gmail.com

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Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[codecov]

Codecov Report

Merging #8723 (5d7396d) into master (5a50219) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8723      +/-   ##
==========================================
- Coverage   42.65%   42.64%   -0.02%     
==========================================
  Files         183      183              
  Lines       22972    22972              
==========================================
- Hits         9799     9796       -3     
- Misses      11790    11792       +2     
- Partials     1383     1384       +1     

Impacted Files	Coverage Δ
cmd/argocd/commands/root.go	2.08% <ø> (ø)
controller/cache/cache.go	19.80% <0.00%> (-0.96%)	⬇️
util/settings/settings.go	47.91% <0.00%> (ø)

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Thank you !