[AIRFLOW-2888] Add deprecation path for task_runner config change #4851
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Jira
https://issues.apache.org/jira/browse/AIRFLOW-2888 (extending the change introduced in this Jira to provide a deprecation/upgrade path.)
Description
This change allows users to seamlessly upgrade without a hard-to-debug
error when a task is actually run. This allows us to pull the change introduced in #3740 to 1.10.3 whilst still being nice to our users.
Tests
Commits
Documentation
Code Quality
flake8