fix(cdk:drag-drop): the shard context was not initalized correctly

[danranVm]

PR Checklist

Please check if your PR fulfills the following requirements:

• 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?

• 挂载在 document 的 context 初始化的逻辑不正确
• 导致了 [comp:modal] 弹窗配置destroyOnHide: true, 会导致回调里面的第2个弹窗的拖动不生效 #1436 的 bug

What is the new behavior?

• 正确使用 createSharedComposable， 保证全局共享的 context 的唯一性

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1537 (120afbf) into main (e323867) will increase coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head 120afbf differs from pull request most recent head 1e82a6c. Consider uploading reports for the commit 1e82a6c to get more accurate results

@@           Coverage Diff           @@
##             main    #1537   +/-   ##
=======================================
  Coverage   92.78%   92.79%           
=======================================
  Files         332      332           
  Lines       30909    30906    -3     
  Branches     3557     3557           
=======================================
  Hits        28678    28678           
+ Misses       2231     2228    -3     

Impacted Files	Coverage Δ
packages/cdk/drag-drop/src/utils.ts	58.92% <0.00%> (+2.99%)	⬆️

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