fix(date-picker): refactor date utility functions and week picker to correctly show selected week

[Summer-Shen]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

#2896

Solution

Locale methods in Dayjs sometimes does not change the way dates respond to weekStart customizations. Therefore we rewrite the methods

• startOfWeek that returns the start day of week and
• isSameWeek that compares the week numbers of two dates,

calculating week numbers that changes with weekStart.

Dayjs 中的 locale 方法有时不会改变日期对自定义 weekStart 的响应方式。因此，重写了

• 返回一周开始日期的 startOfWeek 方法和
• 比较两个日期的周数的 isSameWeek 方法

以计算随 weekStart 变化的周数。

How is the change tested?

• Please see the updated WeekPicker demos and switch locale to English to see the correct behavior.
• 请查看更新后的 WeekPicker demo，并将语言切换为英语，以查看正确的行为。

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues	Type
date-picker	fix(date-picker)：重构日期 utility 函数和 WeekPicker，以正确显示所选星期	fix(date-picker): refactor date utility functions and week picker to correctly show selected week	Close #2896	Bug fix
date-picker	docs(date-picker)：更新 demo 中 WeekPicker 与 dayStartOfWeek 的用法	docs(date-picker): update WeekPicker usage with dayStartOfWeek in demo		Documentation change

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others
  should be submitted to main branch)

Other information

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