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Read Airflow major version from PEP 440 image labels (#2464)

Local dev picked the Airflow major version by parsing the image's Airflow
version label as semver. Runtime images built on Airflow dev wheels carry
PEP 440 labels like 3.4.0.dev26657+astro.1, which semver rejects, so the CLI
assumed Airflow 2 and sent airflow_settings.yaml objects to /api/v1, which
Airflow 3 answers with 405.

Take the leading number of the Airflow label instead, still falling back to
the runtime label when the Airflow label is missing. Only 2 and 3 are
accepted; anything else warns and defaults to 2, which the unparseable
runtime label path now also does instead of returning 0.

Co-authored-by: Claude <noreply@anthropic.com>

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