Fix private project editing form

[allanlasser]

This resolves an issue where project visibility data is not correctly loaded into the editing form in the ProjectDialog. The project's private value was not exposed on the structure/project object, leading to it being undefined in state.

This fixes the issue by adding a private property onto the Project structure.

For review

1. In the preview deployment, browse projects and create or edit a public project.
2. The "Private" checkbox should be unselected.
3. Select it, then save changes.
4. The project list should refresh with the new private state. Edit the project again.
5. The "Private" checkbox should be selected.
6. Unselect it, then save changes.
7. The project list should refresh with the new public state.

[netlify]

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🔴	Statements	2.8% (-0% 🔻)	1978/70726
🔴	Branches	3.04%	925/30446
🔴	Functions	3.21% (-0% 🔻)	503/15678
🔴	Lines	2.84% (-0% 🔻)	1796/63215

Test suite run success

84 tests passing in 16 suites.

Report generated by 🧪jest coverage report action from 9de04b8

[duckduckgrayduck]

It works!