Fix: login --name flag to context-name

[bupd]

• Fixes harbor login unknown flag: --name #508

Changes made

• Added --context-name flag.
• Added a conditional check to auto-fill loginView.Name.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 7.39%. Comparing base (60ad0bd) to head (d7fb24d).
⚠️ Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #520      +/-   ##
=========================================
- Coverage   10.99%   7.39%   -3.60%     
=========================================
  Files         173     226      +53     
  Lines        8671   13666    +4995     
=========================================
+ Hits          953    1011      +58     
- Misses       7612   12549    +4937     
  Partials      106     106              

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