feat: add disabled state styling to checkboxes

[longjuan]

What type of PR is this?

/area ui
/kind improvement

What this PR does / why we need it:

当前多选框disabled与非disabled样式上无区别，不好分辨。

Which issue(s) this PR fixes:

Fixes #5974

Special notes for your reviewer:

Does this PR introduce a user-facing change?

增加多选框disabled样式

[f2c-ci-robot]

@longjuan: The label(s) kind/ui cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

/kind ui
/kind improvement

What this PR does / why we need it:

当前多选框disabled与非disabled样式上无区别，不好分辨。

Which issue(s) this PR fixes:

Fixes #5974

Special notes for your reviewer:

Does this PR introduce a user-facing change?

增加多选框disabled样式

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[longjuan]

/area ui

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.16%. Comparing base (bc10336) to head (50080ba).
Report is 35 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6220      +/-   ##
============================================
+ Coverage     54.51%   57.16%   +2.65%     
- Complexity     3523     3717     +194     
============================================
  Files           646      647       +1     
  Lines         21862    21968     +106     
  Branches       1528     1536       +8     
============================================
+ Hits          11917    12558     +641     
+ Misses         9328     8800     -528     
+ Partials        617      610       -7     

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[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruibaby

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• ui/OWNERS [ruibaby]

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