fix(cdk:virtual): render pool item with same item key is not reused

[sallerli1]

when all data is re-rendered, pooled items were asigned to data with different item key

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What is the current behavior?

在全部数据被重新渲染之后，所有的渲染池元素被回收并重新分配，当新添加的数据在上次渲染的数据前面时，会将已经回收的元素先分配给新数据，导致老数据在渲染时视图的key与上次渲染不一致。

What is the new behavior?

修复以上问题

Other information

会进行两次遍历，第一次筛选出上一次渲染的数据并分配原本的渲染池元素，第二次遍历剩余的新数据元素从渲染池中按顺序分配元素

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.75%. Comparing base (3ef5760) to head (dca5d3b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1910   +/-   ##
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  Coverage   90.75%   90.75%           
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  Files         359      359           
  Lines       35286    35286           
  Branches     2807     2807           
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  Hits        32024    32024           
  Misses       3262     3262           

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