fix: Grid flexGap lazy check

[zombieJ]

[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
• Other (about what?)

🔗 Related issue link

fix #29200
fix #29201

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix antd crash when load before page ready.
🇨🇳 Chinese	修复 antd 在页面加载之前载入导致的页面崩溃问题。

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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

[codecov]

Codecov Report

Merging #29202 (30e8e0a) into master (b69c335) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master    #29202   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          394       394           
  Lines         7482      7483    +1     
  Branches      2140      2141    +1     
=========================================
+ Hits          7482      7483    +1     

Impacted Files	Coverage Δ
components/_util/styleChecker.tsx	100.00% <100.00%> (ø)
components/grid/col.tsx	100.00% <100.00%> (ø)
components/grid/row.tsx	100.00% <100.00%> (ø)

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[ant-design-bot]

[shaodahong]

位置可以放到最上面

[zombieJ]

放下面是为了减少 canUseDocElement 分支还得写一个赋值，节省一行代码。

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 30e8e0a:

Sandbox	Source
antd reproduction template	Configuration

[github-actions]

Size Change: -40 B (0%)

Total Size: 836 kB

Filename	Size	Change
./dist/antd-with-locales.min.js	336 kB	-15 B (0%)
./dist/antd.min.js	296 kB	-25 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
./dist/antd.compact.min.css	67.3 kB	0 B
./dist/antd.dark.min.css	68.6 kB	0 B
./dist/antd.min.css	67.3 kB	0 B

_{compressed-size-action}

[afc163]

修复 antd 在页面加载之前载入使用 Grid 导致的页面崩溃问题。

不必使用，umd 包引入即报错。

[zombieJ]

rename 一下测试挂了，一脸懵逼……