fix: vertical images are rotated to horizontal when generating thumbnails

[guqing]

What type of PR is this?

/kind improvement
/area core
/milestone 2.20.x

What this PR does / why we need it:

修复竖向图片生成缩略图后会丢失方向信息展示为横向图片的问题

Which issue(s) this PR fixes:

Fixes #6802

Does this PR introduce a user-facing change?

修复竖向图片生成缩略图后会丢失方向信息展示为横向图片的问题

[sonarcloud]

Quality Gate passed

Issues
2 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

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 57.04%. Comparing base (d7aba83) to head (2718db6).
Report is 32 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/halo/app/core/attachment/ThumbnailGenerator.java	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               main    #6842    +/-   ##
==========================================
  Coverage     57.03%   57.04%            
- Complexity     3978     4000    +22     
==========================================
  Files           713      714     +1     
  Lines         23992    24100   +108     
  Branches       1570     1585    +15     
==========================================
+ Hits          13685    13747    +62     
- Misses         9696     9741    +45     
- Partials        611      612     +1     

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[ruibaby]

/lgtm

[ruibaby]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruibaby

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