test: add unit tests for Tasker class (calcom#26975)

- Test that params are properly passed to async tasker methods
- Test that params are passed in correct order
- Test fallback to sync tasker when async tasker fails
- Test params are passed correctly to sync tasker fallback
- Test error handling when both taskers fail
- Test logging of dispatch information with args
- Test behavior when async tasker is disabled (missing env vars)
- Test error details logging

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: ThyMinimalDev