chore: remove unused login cmd

[ldming]

• fix [Improvement] remove unused login and related commands #331

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 43.23%. Comparing base (2c04abc) to head (cef0fef).
⚠️ Report is 164 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/cmd/cluster/dataprotection.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
+ Coverage   42.80%   43.23%   +0.43%     
==========================================
  Files         213      199      -14     
  Lines       29109    27536    -1573     
==========================================
- Hits        12459    11906     -553     
+ Misses      15109    14199     -910     
+ Partials     1541     1431     -110     

Flag	Coverage Δ
unittests	43.23% <0.00%> (+0.43%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[ldming]

/cherry-pick release-0.9

[github-actions]

🤖 says: cherry pick action finished successfully 🎉!
See: https://github.com/apecloud/kbcli/actions/runs/8997466429