fix(cdk:scroll): content is blank when re-activated in keepalive mode

[sallerli1]

PR Checklist

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• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

keepAlive 模式下，再切回到有虚拟滚动的页面，由于页面滚动的位置被重置而储存的滚动位置没有变，导致虚拟滚动内容是空的

What is the new behavior?

activated钩子中，重置holder的scrollTop

Other information

[idux-bot]

This preview will be available after the AzureCI is passed.

[cr-gpt]

with a brief review

This code patch looks to be making a change to the useScrollPlacement() function. The first change is to import the onActivated hook from Vue. The second is to add the initScrollTop() function, which will sync the initial scrollTop value when the holderRef has been set. This should help prevent any initial UI issues.

Overall, the code looks to be well written and should have minimal risk of bugs. The only suggestion I have is to consider adding some unit tests for the new initScrollTop() function to ensure it works correctly.

[codecov]

Codecov Report

Merging #1505 (93d0eaa) into main (88a6d3f) will not change coverage.
The diff coverage is n/a.

❗ Current head 93d0eaa differs from pull request most recent head 2736511. Consider uploading reports for the commit 2736511 to get more accurate results

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  Files         331      331           
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  Branches     3532     3533    +1     
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  Hits        28568    28568           
  Misses       2233     2233           

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