fix(llc, core): Fix wrong changelog entries

[VelikovPetar]

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Linear: FLU-

Github Issue: #

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• The code changes follow best practices
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Description of the pull request

Several ## Upcoming changelog entries were mistakenly filed under the already-released ## 9.26.0 section. This PR moves them back to ## Upcoming where they belong.

stream_chat (llc) — moved into ## Upcoming:

• ✅ Added: predefined filters for QueryChannels on StreamChatClient (queryChannels / queryChannelsWithResult).
• ✅ Added: ChatPersistenceClient.queryChannelStates / saveChannelQueries as the unified read/write methods for channel-query persistence.
• ⚠️ Deprecated: ChatPersistenceClient.getChannelStates / updateChannelQueries in favor of the unified methods.

stream_chat_flutter_core (core) — moved into ## Upcoming:

• ✅ Added: predefined filters on StreamChannelListController.

Documentation-only change (CHANGELOG.md files); no code changes.

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No UI changes.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v9@4a7ca7a). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             v9    #2818   +/-   ##
=====================================
  Coverage      ?   66.90%           
=====================================
  Files         ?      430           
  Lines         ?    27137           
  Branches      ?        0           
=====================================
  Hits          ?    18156           
  Misses        ?     8981           
  Partials      ?        0           

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