[CHA-0] Fix QueryReminders to use filter parameter and improve test assertions

[nijeesh-stream]

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

Changes

1. Fixed query_reminders API call to use filter parameter instead of filter_conditions (both sync and async clients)
2. Enhanced test assertions to verify filter results actually match criteria
3. Added test cases for exact message_id filter and channel_cid filter verification

Why

• The API expects the parameter name filter, not filter_conditions
• Previous tests only checked API success, not that filters actually worked
• This ensures both code correctness and test quality

Testing

• ✅ All sync tests pass with strong filter verification
• ✅ All async tests pass with strong filter verification
• ✅ Tests now verify returned data matches filter criteria
• ✅ Manually verified with production staging credentials

[10printhello]

Just a note: if you've renamed the param to filter here, should the func arg (filter_conditions) change also as the other args match the params (user_id & user_id etc)?

Appreciate this might be a breaking change which is why you haven't. Thought worth mentioning for consistency.

[nijeesh-stream]

same, i didn't want to change it as its a breaking change