Fix missing collection of removed elements from the root

[7hong13]

What this PR does / why we need it?

Any background context you want to provide?

What are the relevant tickets?

• Fix missing collection of removed elements from the root yorkie-js-sdk#676

Fixes #

Checklist

• Added relevant tests or not required
• Didn't break anything

[hackerwins]

Thanks for your contribution.

I wonder why the CI is broken again. 🥲

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (6782b5c) 78.22% compared to head (764d270) 78.38%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   78.22%   78.38%   +0.15%     
==========================================
  Files          63       63              
  Lines        3679     3715      +36     
  Branches      573      580       +7     
==========================================
+ Hits         2878     2912      +34     
+ Misses        503      498       -5     
- Partials      298      305       +7     

Files	Coverage Δ
...c/main/kotlin/dev/yorkie/document/crdt/TextInfo.kt	88.23% <100.00%> (+2.02%)	⬆️
...lin/dev/yorkie/document/operation/EditOperation.kt	70.96% <100.00%> (ø)
...tlin/dev/yorkie/document/operation/SetOperation.kt	70.58% <100.00%> (+1.83%)	⬆️
...in/dev/yorkie/document/operation/StyleOperation.kt	76.92% <100.00%> (+5.49%)	⬆️
...ie/src/main/kotlin/dev/yorkie/document/Document.kt	70.70% <0.00%> (+0.14%)	⬆️
...in/kotlin/dev/yorkie/document/crdt/RgaTreeSplit.kt	67.53% <0.00%> (-0.26%)	⬇️
...c/main/kotlin/dev/yorkie/document/json/JsonText.kt	72.72% <90.90%> (-0.61%)	⬇️
...c/main/kotlin/dev/yorkie/api/OperationConverter.kt	97.51% <50.00%> (-1.84%)	⬇️
...c/main/kotlin/dev/yorkie/document/crdt/CrdtText.kt	85.33% <76.47%> (-3.00%)	⬇️

... and 2 files with indirect coverage changes

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