feat: add support for creating a new group when uploading attachments

[LEIYOUSU]

What type of PR is this?

/kind improvement
/area ui
/milestone 2.20.x

What this PR does / why we need it:

支持在附件上传界面创建新分组。

Which issue(s) this PR fixes:

Fixes #6942

Special notes for your reviewer:

Does this PR introduce a user-facing change?

支持在附件上传界面创建新分组。

[CLAassistant]

All committers have signed the CLA.

[ruibaby]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.You have signed the CLA already but the status is still pending? Let us recheck it.

Hi @LEIYOUSU ，感谢参与贡献，在合并之前需要签署一下我们的 CLA 协议。

[ruibaby]

另外，看起来有 CI 没过，建议在本地执行一下 pnpm lint。

https://github.com/halo-dev/halo/actions/runs/11531383268/job/32102020528?pr=6951

[LEIYOUSU]

另外，看起来有 CI 没过，建议在本地执行一下 pnpm lint。

https://github.com/halo-dev/halo/actions/runs/11531383268/job/32102020528?pr=6951

非常不好意思，由于是第一次进行PR修改，还不太熟悉，这里运行了pnpm eslint D:\git\halo\halo\ui\console-src\modules\contents\attachments\components\AttachmentUploadModal.vue ，显示需要配置文件，是参照项目中已有的配置文件么?

[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

[ruibaby]

另外，看起来有 CI 没过，建议在本地执行一下 pnpm lint。
https://github.com/halo-dev/halo/actions/runs/11531383268/job/32102020528?pr=6951

非常不好意思，由于是第一次进行PR修改，还不太熟悉，这里运行了pnpm eslint D:\git\halo\halo\ui\console-src\modules\contents\attachments\components\AttachmentUploadModal.vue ，显示需要配置文件，是参照项目中已有的配置文件么?

没关系，看起来是因为 import 顺序导致的，但这个项目应该会在提交代码之前执行一下 prettier，我不清楚你这边为什么没有自动执行。另外，建议编辑器使用项目内的 Prettier 和 ESLint 规则。

其他地方没有问题，我将合并此 PR，感谢参与贡献～

[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruibaby

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.23%. Comparing base (eff73dc) to head (4980d7c).
Report is 40 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6951      +/-   ##
============================================
+ Coverage     56.99%   57.23%   +0.23%     
- Complexity     3999     4005       +6     
============================================
  Files           714      712       -2     
  Lines         24110    24123      +13     
  Branches       1585     1588       +3     
============================================
+ Hits          13742    13806      +64     
+ Misses         9756     9704      -52     
- Partials        612      613       +1     

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