Fix presenceEventQueue Iteration Issues in publishPresenceEvents()

[7hong13]

What this PR does / why we need it?

The presenceEventQueue iteration in publishPresenceEvents() faced several issues:

• Using listIterator() resulted in a ConcurrentModificationException due to the possibility of new events being added to the queue during iteration.
• Copying the queue for iteration caused already processed events to be republished asynchronously by publishPresenceEvent().

This PR resolves these issues by enforcing that new events can only be added to the presenceEventQueue right before iteration begins. This approach prevents ConcurrentModificationException without the need for queue copying, addressing the problems.

Any background context you want to provide?

What are the relevant tickets?

Fixes #

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 54.34783% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 79.40%. Comparing base (8c2e63f) to head (4aa9a04).

❗ Current head 4aa9a04 differs from pull request most recent head b44017c. Consider uploading reports for the commit b44017c to get more accurate results

Files	Patch %	Lines
...ie/src/main/kotlin/dev/yorkie/document/Document.kt	55.81%	13 Missing and 6 partials ⚠️
yorkie/src/main/kotlin/dev/yorkie/core/Client.kt	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #165       +/-   ##
=========================================
+ Coverage      0   79.40%   +79.40%     
=========================================
  Files         0       63       +63     
  Lines         0     3889     +3889     
  Branches      0      610      +610     
=========================================
+ Hits          0     3088     +3088     
- Misses        0      474      +474     
- Partials      0      327      +327     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.