[v3-1-test] Add back template.significant.rst (#60490)

newsfragments/template.significant.rst

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+.. Write a short and imperative summary of this changes
+
+.. Provide additional contextual information
+
+.. Check the type of change that applies to this change
+.. Dag changes: requires users to change their Dag code
+.. Config changes: requires users to change their Airflow config
+.. API changes: requires users to change their Airflow REST API calls
+.. CLI changes: requires users to change their Airflow CLI usage
+.. Behaviour changes: the existing code won't break, but the behavior is different
+.. Plugin changes: requires users to change their Airflow plugin implementation
+.. Dependency changes: requires users to change their dependencies (e.g., Postgres 12)
+.. Code interface changes: requires users to change other implementations (e.g., auth manager)
+
+* Types of change
+
+  * [ ] Dag changes
+  * [ ] 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
+
+.. e.g.,
+.. * Remove context key ``execution_date``
+.. * context key ``triggering_dataset_events`` → ``triggering_asset_events``
+.. * Remove method ``airflow.providers_manager.ProvidersManager.initialize_providers_dataset_uri_resources`` → ``airflow.providers_manager.ProvidersManager.initialize_providers_asset_uri_resources``