Fix form type prompt

[CCherry07]

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This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

What's the background?

1、处理即将废弃的类型 ValidationRule
2、更新 FormLabelAlign 以及 FormLayout 的类型提示

1. Describe the source of requirement.
2. Resolve what problem.
3. Related issue link.

API Realization (Optional if not new feature)

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2. List final API realization and usage sample.
3. GIF or snapshot should be provided if includes UI/interactive modification.

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