Add newsfragment

Author: pierrejeambrun

airflow-core/newsfragments/50693.significant.rst

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+Unused webserver configuration options have been removed
+
+The following webserver options were moved into the ``api`` section:
+
+* ``[webserver] log_fetch_timeout_sec`` → ``[api] log_fetch_timeout_sec``
+* ``[webserver] hide_paused_dags_by_default`` → ``[api] hide_paused_dags_by_default``
+* ``[webserver] page_size`` → ``[api] page_size``
+* ``[webserver] default_wrap`` → ``[api] default_wrap``
+* ``[webserver] require_confirmation_dag_change`` → ``[api] require_confirmation_dag_change``
+* ``[webserver] auto_refresh_interval`` → ``[api] auto_refresh_interval``
+
+The following configuration options are now unused and have been removed:
+
+- ``[webserver] instance_name_has_markup``
+- ``[webserver] warn_deployment_exposure``
+
+* Types of change
+
+  * [ ] Dag changes
+  * [x] Config changes
+  * [ ] API changes
+  * [ ] CLI changes
+  * [ ] Behaviour changes
+  * [ ] Plugin changes
+  * [ ] Dependency changes
+  * [ ] Code interface changes
+
+.. List the migration rules needed for this change (see https://github.com/apache/airflow/issues/41641)
+
+* Migration rules needed
+
+  * ``airflow config lint``
+
+    * [ ] Remove configuration option ``[webserver] instance_name_has_markup``
+    * [ ] Remove configuration option ``[webserver] warn_deployment_exposure``
+    * [ ] [webserver] log_fetch_timeout_sec`` → ``[api] log_fetch_timeout_sec``
+    * [ ] [webserver] hide_paused_dags_by_default`` → ``[api] hide_paused_dags_by_default``
+    * [ ] [webserver] page_size`` → ``[api] page_size``
+    * [ ] [webserver] default_wrap`` → ``[api] default_wrap``
+    * [ ] [webserver] require_confirmation_dag_change`` → ``[api] require_confirmation_dag_change``
+    * [ ] [webserver] auto_refresh_interval`` → ``[api] auto_refresh_interval``