fix: Checkbox in Tree should align self start with text

[MadCcc]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Workflow
• Other (about what?)

🔗 Related issue link

close #44803

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Tree that Checkbox should be aligned with first line.
🇨🇳 Chinese	修复 Tree 组件样式，使 Checkbox 与文字第一行对齐

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

---

🚀 Summary

🤖 Generated by Copilot at 82c55ff

Added a new multiple-line demo for the Tree component and updated the documentation and style accordingly. Simplified the horizontal demo of the Anchor component and fixed some issues with the image test and the back-top demo of the FloatButton component.

🔍 Walkthrough

🤖 Generated by Copilot at 82c55ff

• Remove unused anchor links and div elements from the horizontal demo of the Anchor component (link, link)
• Reduce the height of the div element in the back-top demo of the FloatButton component to fit in the screen (link)
• Add a new multiple-line demo of the Tree component, with nodes that have long and multiple lines of text (link, link, link, link, link)
• Modify the style of the tree node title to improve the layout of the multiple-line nodes (link)
• Change the logic of the image test file to use the scroll height of the rendered page to set the viewport, instead of waiting for the end-of-screen element, to ensure the full page screenshot is captured correctly (link, link)
• Delete the image test file for the BackTop component, as it is not needed (link)

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size-limit report 📦

Path	Size
./dist/antd.min.js	393.58 KB (+14 B 🔺)
./dist/antd-with-locales.min.js	452.74 KB (+14 B 🔺)

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Build	Status	Details	Updated (UTC)
default (Inspect)	👍 Changes approved	1 change	Sep 13, 2023, 8:20 AM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b2b961e) 100.00% compared to head (9b10c16) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #44827   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          681       681           
  Lines        11526     11526           
  Branches      3103      3103           
=========================================
  Hits         11526     11526           

Files Changed	Coverage Δ
components/tree/style/index.ts	100.00% <ø> (ø)

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