fix(module: Pagination): Pager 3 and 5 may be invisible when window width is small and there're many pages

[fcxxzux]

🤔 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

Fixes #2124

💡 Background and solution

There're several issues with Pagination component, some are invisible, while some are affecting user experience under small screens

1. Immediately after the component is loaded, the class attribute of PaginationPager 5 is not properly set:
   class="ant-pagination-item-after-jump-prev ant-pagination-item ant-pagination-item-5 ant-pagination-item-after-jump-prev"

• Should be before-jump-next instead of after-jump-prev
• There're 2 ant-pagination-item-after-jump-prev, which is redundant
  

2. Click Page 5, we can see that PaginationPager 5 still holds ant-pagination-item-after-jump-prev class, which is unexpected
   

3. Then click Page 3, both PaginationPager 3 and 5 holds ant-pagination-item-after-jump-prev class, so they'll disappear when the screen width is small.
   

So, fixes:

1. if (itemBeforeJumpNext) Class="@($"{PrefixCls}-item-before-jump-next")"
2. In PaginationPager.OnInitialized(), remove redundant adding of class itself to ClassMapper again
3. For each normal pager in pagerList, explicitly set Class=""

Tested locally, class for each pager is set properly,
and we can see pager 5 when it's selected on small screen width now.

📝 Changelog

Language	Changelog
🇺🇸 English	Fix: Pagination won't show certain current page block when window width is small after a specific sequence of operation
🇨🇳 Chinese	修复 Pagination 在较小的屏幕宽度下，特定操作后，不会显示当前选中页的问题

☑️ 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
• Changelog is provided or not needed

[dnfadmin]

All CLA requirements met.

[github-actions]

[codecov]

Codecov Report

Merging #2616 (4db5af5) into master (5c8b0e4) will increase coverage by 2.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2616      +/-   ##
==========================================
+ Coverage   27.62%   29.64%   +2.02%     
==========================================
  Files         497      520      +23     
  Lines       33550    25700    -7850     
  Branches        0      250     +250     
==========================================
- Hits         9268     7620    -1648     
+ Misses      24282    18040    -6242     
- Partials        0       40      +40     

Impacted Files	Coverage Δ
components/pagination/Pagination.razor	0.00% <0.00%> (ø)
components/pagination/PaginationPager.razor	0.00% <ø> (ø)
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%)	⬇️
components/core/Helpers/DateHelper.cs	80.00% <0.00%> (-2.71%)	⬇️
...onents/date-picker/internal/DatePickerHeader.razor	43.90% <0.00%> (-2.48%)	⬇️
components/menu/SubMenu.razor	63.93% <0.00%> (-2.30%)	⬇️
... and 425 more

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[ElderJames]

LGTM