Add support for signac-flow 0.24

[joaander]

Description

Move @project.operation to the bottom. This fixes errors with signac-flow 0.24.0.

Checklist:

• [x] I have reviewed the Contributor Guidelines.
• [x] I agree with the terms of the HOOMD-blue Contributor Agreement.
• [x] My name is on the list of authors.

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