fix: prioritize login page route to prevent single page override

[guqing]

What type of PR is this?

/kind bug
/area core
/milestone 2.20.x

What this PR does / why we need it:

修复登录页面路由会被自定义页面覆盖导致无法登录的问题

Which issue(s) this PR fixes:

Fixes #6893

Does this PR introduce a user-facing change?

修复登录页面路由会被自定义页面路由覆盖导致无法登录的问题

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.22%. Comparing base (eff73dc) to head (6154c0f).
Report is 34 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6926      +/-   ##
============================================
+ Coverage     56.99%   57.22%   +0.23%     
- Complexity     3999     4005       +6     
============================================
  Files           714      712       -2     
  Lines         24110    24117       +7     
  Branches       1585     1592       +7     
============================================
+ Hits          13742    13802      +60     
+ Misses         9756     9700      -56     
- Partials        612      615       +3     

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[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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