Fix inconsistent garbage collection for multiple nodes in text and tree type

[7hong13]

What this PR does / why we need it?

Any background context you want to provide?

What are the relevant tickets?

• Fix inconsistent garbage collection for multiple nodes in text and tree type yorkie-js-sdk#806

Fixes #

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 79.13%. Comparing base (92039e2) to head (dd46237).

Files	Patch %	Lines
...c/main/kotlin/dev/yorkie/document/crdt/CrdtRoot.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
+ Coverage   79.10%   79.13%   +0.02%     
==========================================
  Files          63       63              
  Lines        4025     4025              
  Branches      644      644              
==========================================
+ Hits         3184     3185       +1     
+ Misses        488      487       -1     
  Partials      353      353              

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