fix(test): Don't tear down AirflowClusters when --skip-delete is used

[sbernauer]

Description

I ran into this problem enough times to tell claude to fix it

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[adwk67]

I haven't checked in detail, but if these steps are all identical, can they instead use a script in the commons folder, alongside health.py and metrics.py?

[sbernauer]

Good call, did so in ebb3239

[adwk67]

LGTM - Thanks for this!