fix race condition in sdb-operator

[aIbrahiim]

Fixes: #38692

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[github-actions]

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[aIbrahiim]

assign to next reviewer

[aIbrahiim]

cc: @damccorm

[damccorm]

/gemini review

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[damccorm]

I mirrored these changes and I'm trying them out

• here: https://github.com/apache/beam/actions/runs/26638317427
• and here: https://github.com/apache/beam/actions/runs/26638345906

[damccorm]

LGTM - we've at least made it past installing the cluster which is where it was failing before because it was race conditioning.

Thanks!