[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
2. Enhanced test assertions to verify filter results actually match criteria
3. Added new test case for message_id 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 3 test cases pass (query reminders, channel filter, message_id filter)
• ✅ Tests now verify returned data matches filter criteria
• ✅ Manually verified with production staging credentials