feat: add empty state for restore by backups

[ruibaby]

What type of PR is this?

/area ui
/kind improvement
/milestone 2.20.x

What this PR does / why we need it:

为通过备份文件恢复的界面添加空状态提示。

Does this PR introduce a user-facing change?

为通过备份文件恢复的界面添加空状态提示。

[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 SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.27%. Comparing base (eff73dc) to head (e00e345).
Report is 63 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7078      +/-   ##
============================================
+ Coverage     56.99%   57.27%   +0.27%     
- Complexity     3999     4010      +11     
============================================
  Files           714      712       -2     
  Lines         24110    24154      +44     
  Branches       1585     1592       +7     
============================================
+ Hits          13742    13833      +91     
+ Misses         9756     9706      -50     
- Partials        612      615       +3     

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[guqing]

/lgtm

[f2c-ci-robot]

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