refactor: unified empty state UI action button styles

[ruibaby]

What type of PR is this?

/area ui
/kind improvement
/milestone 2.20.x

What this PR does / why we need it:

统一空状态界面中操作按钮的风格。

Does this PR introduce a user-facing change?

统一空状态界面中操作按钮的风格。

[sonarcloud]

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 58.18%. Comparing base (6cd8dc8) to head (03fd992).
Report is 88 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##               main    #6704     +/-   ##
===========================================
  Coverage     58.18%   58.18%             
- Complexity     3774     3944    +170     
===========================================
  Files           651      679     +28     
  Lines         22125    23216   +1091     
  Branches       1538     1582     +44     
===========================================
+ Hits          12873    13508    +635     
- Misses         8641     9084    +443     
- Partials        611      624     +13     

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[guqing]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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• ui/OWNERS [guqing]

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