Replace deprecated SendReaction and DeleteReaction methods

[orhanerday]

Replaced the deprecated Channel.SendReaction and DeleteReaction method with the updated SendReaction method to align with the latest SDK changes.

Details

• Updated method calls to prevent future deprecation issues.
• Verified that all affected functionalities behave as expected.

Testing
All unit and integration tests passed successfully.

=== RUN   TestReactions
--- PASS: TestReactions (5.10s)
PASS

Process finished with the exit code 0