fix:(module:datepicker): wrong day headers when FirstDayOfWeek!=Sunday

[Alexbits]

🤔 This is a ...

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

🔗 Related issue link

💡 Background and solution

Fixes the day headers order issue from #1551

The fix is not ideal maybe. Because if the user changes the order in DateLocale.ShortWeekDays this will still cause wrong day headers. So the order of days in DateLocale.ShortWeekDays should be preserved.

Anyways, it's better than what we have now.

📝 Changelog

Language	Changelog
🇺🇸 English
🇨🇳 Chinese

☑️ 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
• Changelog is provided or not needed

[github-actions]

[codecov]

Codecov Report

Merging #2571 (16e07d9) into feature (4818d8b) will increase coverage by 3.25%.
The diff coverage is 75.00%.

@@             Coverage Diff             @@
##           feature    #2571      +/-   ##
===========================================
+ Coverage    27.68%   30.94%   +3.25%     
===========================================
  Files          503      541      +38     
  Lines        34064    26274    -7790     
  Branches         0      260     +260     
===========================================
- Hits          9430     8130    -1300     
+ Misses       24634    18104    -6530     
- Partials         0       40      +40     

Impacted Files	Coverage Δ
...date-picker/internal/DatePickerDatetimePanel.razor	70.78% <ø> (+70.78%)	⬆️
...nts/date-picker/internal/DatePickerDatePanel.razor	68.29% <75.00%> (+12.73%)	⬆️
components/core/Helpers/MemberPath/PathNode.cs	46.15% <0.00%> (-8.85%)	⬇️
components/core/Reflection/TypeDefined.cs	77.77% <0.00%> (-7.94%)	⬇️
components/input/InputGroup.razor.cs	87.50% <0.00%> (-6.95%)	⬇️
...ponents/date-picker/types/DatePickerPlaceholder.cs	22.72% <0.00%> (-4.20%)	⬇️
...ponents/core/Component/Overlay/type/TriggerType.cs	81.25% <0.00%> (-2.97%)	⬇️
...onents/date-picker/internal/DatePickerHeader.razor	43.90% <0.00%> (-2.48%)	⬇️
components/menu/SubMenu.razor	63.93% <0.00%> (-2.30%)	⬇️
components/timeline/Timeline.razor.cs	63.21% <0.00%> (-2.24%)	⬇️
... and 446 more

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[ElderJames]

The fix is not ideal maybe. Because if the user changes the order in DateLocale.ShortWeekDays this will still cause wrong day headers. So the order of days in DateLocale.ShortWeekDays should be preserved.

@Alexbits I think we need to add some notes to the document.

[Alexbits]

The fix is not ideal maybe. Because if the user changes the order in DateLocale.ShortWeekDays this will still cause wrong day headers. So the order of days in DateLocale.ShortWeekDays should be preserved.

@Alexbits I think we need to add some notes to the document.

I'm not sure where @ElderJames?

[ElderJames]

Here site\AntDesign.Docs\Demos\Components\DatePicker\doc\index.en-US.md

[ElderJames]

@Alexbits Please solve the conflicts