RedisTaskHandler - Rework remote task log handling for the structlog era

[jason810496]

Body

Following #48491
we need also to convert RedisTaskHandler

airflow/providers/redis/src/airflow/providers/redis/log/redis_task_handler.py

Line 36 in 1447705

class RedisTaskHandler(FileTaskHandler, LoggingMixin):

Committer

• I acknowledge that I am a maintainer/committer of the Apache Airflow project.

[eladkal]

Ash mentioned there is no need for handlers that only read
#48491 (comment)