Add support for restoring from backup root

[JohnNiang]

What type of PR is this?

/kind feature
/area core
/area console

What this PR does / why we need it:

This PR adds support of restoring from backup root.

Which issue(s) this PR fixes:

Fixes #6370

Special notes for your reviewer:

Does this PR introduce a user-facing change?

支持从备份目录选择文件进行恢复

[JohnNiang]

Hi @halo-dev/sig-halo-console , please help me adapt the console to support restoring Halo from backup root.

[ruibaby]

Hi @halo-dev/sig-halo-console , please help me adapt the console to support restoring Halo from backup root.

vme50，and then live-stream teaching you console adaptation

[JohnNiang]

Hi @ruibaby , 选择备份文件进行恢复时，没有提示选择的具体备份文件

[ruibaby]

/retitle Add support of restoring from backup root

[ruibaby]

/lgtm

[f2c-ci-robot]

New changes are detected. LGTM label has been removed.

[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

[guqing]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing

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• OWNERS [guqing]

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[codecov]

Codecov Report

Attention: Patch coverage is 56.66667% with 26 lines in your changes missing coverage. Please review.

Project coverage is 58.18%. Comparing base (d19c27b) to head (6cd8dc8).
Report is 9 commits behind head on main.

Files	Patch %	Lines
...java/run/halo/app/migration/MigrationEndpoint.java	21.42%	22 Missing ⚠️
...c/main/java/run/halo/app/migration/BackupFile.java	60.00%	2 Missing ⚠️
.../halo/app/migration/impl/MigrationServiceImpl.java	92.59%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6486      +/-   ##
============================================
- Coverage     58.27%   58.18%   -0.10%     
+ Complexity     3783     3774       -9     
============================================
  Files           651      651              
  Lines         22139    22125      -14     
  Branches       1555     1538      -17     
============================================
- Hits          12902    12873      -29     
- Misses         8613     8641      +28     
+ Partials        624      611      -13     

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