refactor: optimize request headers when generating thumbnails from URI

[guqing]

What type of PR is this?

/kind improvement
/area core
/milestone 2.20.x

What this PR does / why we need it:

优化根据 URI 生成缩略图时的请求头

1. 由于之前 attachment 的 permalink 是 URI.toString 会导致根据 permalink 索引查询附件可能由于编码问题无法查询到导致生成缩略图只能根据 URI 生成
2. 可能配置了 nginx 判断请求头不允许脚本请求如导致根据 URI 访问图片无法访问导致无法生成，如

if ($http_user agent ~*(python curlljava wget go-http-client httpclient okhttp)){
}

Fixes #6627

Does this PR introduce a user-facing change?

优化根据 URI 生成缩略图时的请求头，修复可能因为无法访问原图导致无法正常生成的问题。

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 58.06%. Comparing base (6cd8dc8) to head (e98faee).
Report is 60 commits behind head on main.

Files with missing lines	Patch %	Lines
...tachment/reconciler/LocalThumbnailsReconciler.java	0.00%	2 Missing ⚠️
...re/attachment/reconciler/AttachmentReconciler.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6628      +/-   ##
============================================
- Coverage     58.18%   58.06%   -0.13%     
- Complexity     3774     3916     +142     
============================================
  Files           651      670      +19     
  Lines         22125    22974     +849     
  Branches       1538     1576      +38     
============================================
+ Hits          12873    13339     +466     
- Misses         8641     9019     +378     
- Partials        611      616       +5     

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[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

[JohnNiang]

/approve

[JohnNiang]

/cherrypick release-2.19

[halo-dev-bot]

@JohnNiang: once the present PR merges, I will cherry-pick it on top of release-2.19 in a new PR and assign it to you.

In response to this:

/cherrypick release-2.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang, ruibaby

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• OWNERS [JohnNiang,ruibaby]

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[halo-dev-bot]

@JohnNiang: new pull request created: #6633

In response to this:

/cherrypick release-2.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.