Replace deprecated command fleets to fleet list

[wallem89]

Deprecated command fleets replaced by fleet list

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[myarmolinsky]

Thank you for the PR! Could you please rebase it against master (and address the tiny nit) so that I can approve a workflow run with the latest changes?

Invalidated by push of 481ff4d

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Invalidated by push of 481ff4d

Invalidated by push of 05d793a

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