fix(ui): fix StreamChannel not available in various poll dialogs

[xsahil03x]

This pull request addresses a bug fix in the stream_chat_flutter package, ensuring that the StreamChannel is properly available in the widget tree for various poll-related dialogs. The changes primarily involve wrapping the ValueListenableBuilder in a StreamChannel widget to provide the necessary context.

Bug Fixes:

• packages/stream_chat_flutter/CHANGELOG.md: Added a note about the fix for StreamChannel not being available in the widget tree for various poll options.

Poll Dialogs:

• packages/stream_chat_flutter/lib/src/poll/stream_poll_comments_dialog.dart: Wrapped ValueListenableBuilder in a StreamChannel widget to ensure the channel context is available. [1] [2]
• packages/stream_chat_flutter/lib/src/poll/stream_poll_option_votes_dialog.dart: Wrapped ValueListenableBuilder in a StreamChannel widget to ensure the channel context is available. [1] [2]
• packages/stream_chat_flutter/lib/src/poll/stream_poll_options_dialog.dart: Wrapped ValueListenableBuilder in a StreamChannel widget to ensure the channel context is available. [1] [2]
• packages/stream_chat_flutter/lib/src/poll/stream_poll_results_dialog.dart: Wrapped ValueListenableBuilder in a StreamChannel widget to ensure the channel context is available. [1] [2]

[deven98]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.

Project coverage is 60.15%. Comparing base (b9871eb) to head (e165585).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...tter/lib/src/poll/stream_poll_comments_dialog.dart	0.00%	11 Missing ⚠️
.../lib/src/poll/stream_poll_option_votes_dialog.dart	0.00%	8 Missing ⚠️
...utter/lib/src/poll/stream_poll_results_dialog.dart	0.00%	8 Missing ⚠️
...utter/lib/src/poll/stream_poll_options_dialog.dart	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2082      +/-   ##
==========================================
- Coverage   60.17%   60.15%   -0.02%     
==========================================
  Files         372      372              
  Lines       22766    22773       +7     
==========================================
  Hits        13699    13699              
- Misses       9067     9074       +7     

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[deven98]

LGTM