fix: relogin command ignores --argocd-context flag

[AlJohri]

Summary

• argocd relogin --argocd-context <name> uses the current context's server instead of the server from the specified --argocd-context, causing credentials to be sent to the wrong ArgoCD server
• The root cause is that relogin.go hardcodes localCfg.CurrentContext instead of using clientOpts.Context (the --argocd-context flag value), unlike every other command which correctly passes clientOpts.Context to ResolveContext()
• Fix: use clientOpts.Context for context resolution (which already falls back to CurrentContext when empty), and use configCtx.Name for the upsert and status message

Test plan

• Set current context to cluster A (argocd context cluster-a)
• Run argocd relogin --argocd-context cluster-b --password <cluster-b-password>
• Verified it succeeds and prints Context 'cluster-b' updated (previously failed with "Invalid username or password" and would have printed Context 'cluster-a' updated)
• Verify argocd relogin without --argocd-context still works (falls back to current context via ResolveContext(""))

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.89%. Comparing base (4c59c3c) to head (98b50b4).

Files with missing lines	Patch %	Lines
cmd/argocd/commands/relogin.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #26796   +/-   ##
=======================================
  Coverage   62.89%   62.89%           
=======================================
  Files         414      414           
  Lines       56143    56143           
=======================================
+ Hits        35310    35313    +3     
+ Misses      17480    17476    -4     
- Partials     3353     3354    +1     

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[choejwoo]

Generally LGTM.

Could we add a regression test covering argocd relogin --argocd-context <other-context> so we verify it updates the selected context rather than current-context?

[ppapapetrou76]

I agree with @choejwoo - let's add a quick test ( I would expect that the test would fail before the change and succeeds after the change )

[dudinea]

It would be great if you added an example using the --argocd-context flag to the usage string, so people know that this option an be used with this command.