Add admin endpoint for publishing and unpublishing a project

[GianlucaFicarelli]

Add admin endpoints:

• POST /admin/publish-project/{project_id}
• POST /admin/unpublish-project/{project_id}

with parameters:

• max_assets (optional) that can be used to limit the number of assets to be moved in one request. In that case, the endpoint should be called sequentially multiple times.
• dry_run that can be set to true to simulate the operation. It's recommended to call the endpoint with dry_run=true before running it with dry_run=false.

Implement https://github.com/openbraininstitute/prod-platform-architecture/issues/192

[codecov]

Codecov Report

❌ Patch coverage is 98.37838% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
app/utils/s3.py	95.38%	1 Missing and 2 partials ⚠️

Flag	Coverage Δ
pytest	97.93% <98.37%> (+0.01%)	⬆️

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Files with missing lines	Coverage Δ
app/config.py	97.75% <100.00%> (+0.25%)	⬆️
app/db/utils.py	84.21% <100.00%> (+0.42%)	⬆️
app/routers/admin.py	100.00% <100.00%> (ø)
app/schemas/publish.py	100.00% <100.00%> (ø)
app/service/publish.py	100.00% <100.00%> (ø)
app/utils/s3.py	88.26% <95.38%> (+4.10%)	⬆️

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