[bitnami/airflow] Allow multiple executors with CeleryExecutor

[jdel]

Description of the change

Allow use of multiple executors as available since Airflow 2.10.0

See related Container PR

This is a follow up to #29107

Benefits

Airflow 3.x does not allow hybrid executors to be used anymore in favor of the multiple executor syntax.

The current Bitnami chart for 3.0.3 will not spawn a celery worker when using the new multiple executor syntax because it is checking for an exact match on CeleryExecutor.

Making effectively impossible to deploy a hybrid Celery/k8s environment with 3.0.3.

Possible drawbacks

The condition change preserves backwards compatibility so I don't see any.

Applicable issues

• Depends on [bitnami/airflow] Allow multiple executors with CeleryExecutor containers#84530

Additional information

The rest of the checklist will be done when the container PR is merged

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• All commits signed off and in agreement of Developer Certificate of Origin (DCO)

[carrodher]

Thanks for your contribution! Could you please bump the chart version in the Chart.yaml? This is necessary to test the changes and cut a new release.

[jdel]

I will bump up the version and finish this PR when bitnami/containers#84530 gets merged and the new docker image is available