fix(cli): copy ServerName into clientOpts in login command

[noam-codefresh]

Fixes #16266

this will pass the ServerName flag value (or ARGOCD_SERVER_NAME env var) from the globalClientOpts to the options used by the login command. when trying to login using --port-forward this value is needed.

Checklist:

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[ishitasequeira]

LGTM!!!

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (58da6a3) 49.51% compared to head (241ae34) 49.52%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #16267   +/-   ##
=======================================
  Coverage   49.51%   49.52%           
=======================================
  Files         269      269           
  Lines       46990    46991    +1     
=======================================
+ Hits        23269    23272    +3     
+ Misses      21437    21436    -1     
+ Partials     2284     2283    -1     

Files	Coverage Δ
cmd/argocd/commands/login.go	2.81% <0.00%> (-0.01%)	⬇️

... and 1 file with indirect coverage changes

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[pasha-codefresh]

/cherry-pick release-2.9

[thesuperzapper]

@crenshaw-dev @pasha-codefresh it seems like something went wrong as this has not made its way into the 2.9.2 argocd cli version.

There was a related chery-pick #16457, but we probably also need this PR in 2.9.

[thesuperzapper]

@pasha-codefresh I think this is still not chery-picked into 2.9, are we only going to fix this bug in 2.10?

[noam-codefresh]

the fix was merged to the main branch before release-2.10 started, so it is included in 2.10.
i don't know why it never got cherry-picked to 2.9. i guess right now it doesn't matter much.