Add mapping for deprecated default value for executor in core section#48800
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Currently, config setting
AIRFLOW__CORE__EXECUTOR=SequentialExecutorin Airflow 3.0 causes issues without providing a proper error message. This PR does two changes:AIRFLOW__CORE__EXECUTOR=SequentialExecutoris set, it now throws an appropriate error and updates the default executor toLocalExecutorwithin thevalidate()method ofconfiguration.py.AIRFLOW__CORE__EXECUTORin theairflow config updatecommand.airflow config upgradeupgradesexecutor=SequentialExecutortoexecutor=LocalExecutor.I tested it, and you can see that the yellow warning is now from configuration validation, while the rest of it is from the

airflow config updateas in the following screenshot:airflow.cfgbefore:After running

airflow config update, airflow.cfg is change to:closes: #48765
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