chore(ui): Cleanup channel preview theme

[renefloor]

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CLA

• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

This removes the channel preview theme and updates or removes all code using it.

Screenshots / Videos

Before	After

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[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v10.0.0@ac3528a). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...h_scroll_view/stream_message_search_list_tile.dart	0.00%	5 Missing ⚠️
...ottom_sheets/stream_channel_info_bottom_sheet.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             v10.0.0    #2622   +/-   ##
==========================================
  Coverage           ?   66.22%           
==========================================
  Files              ?      417           
  Lines              ?    25304           
  Branches           ?        0           
==========================================
  Hits               ?    16757           
  Misses             ?     8547           
  Partials           ?        0           

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