Auto-correct stale bundle_name in DAG versions when DAG bundle configuration changes

[vatsrahul1001]

When the DAG bundle name is changed the dag_version.bundle_name field still points to the old, inactive bundle.
This causes a ValueError: Requested bundle is not configured error when accessing affected DAGs.

closes: #49861

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[TJaniF]

Tested this with and it fixes the issue reported here: #49861 for me.

Also tested with 2 local dag bundles:

started with this:

AIRFLOW__DAG_PROCESSOR__DAG_BUNDLE_CONFIG_LIST='[
    {
        "name": "dags-folder1",
        "classpath": "airflow.dag_processing.bundles.local.LocalDagBundle",
        "kwargs": {
            "path": "/files/dags/"
        }
    },
    {
        "name": "dags-folder2",
        "classpath": "airflow.dag_processing.bundles.local.LocalDagBundle",
        "kwargs": {
            "path": "/files/dags2/"
        }
    }
]'

Ran both dags, added a task to both dags, ran both dags again so both have a v2 version
then restart with

AIRFLOW__DAG_PROCESSOR__DAG_BUNDLE_CONFIG_LIST='[
    {
        "name": "dags-folder1-RENAMED",
        "classpath": "airflow.dag_processing.bundles.local.LocalDagBundle",
        "kwargs": {
            "path": "/files/dags/"
        }
    },
    {
        "name": "dags-folder2",
        "classpath": "airflow.dag_processing.bundles.local.LocalDagBundle",
        "kwargs": {
            "path": "/files/dags2/"
        }
    }
]'

All runs correctly

Removing one of the bundles also works as expected: the dag history is still shown but running it is not possible.

No API server errors :)

[phanikumv]

Please add a test covering this

[vatsrahul1001]

Please add a test covering this

Done

[ephraimbuddy]

While this worked, it doesn't seem like the right solution. A bundle was chosen randomly and versions updated.