refactor(): Moved implementation of the report functionality out of Flow360 package

[benflexcompute]

@codex

---

Note

Breaking change: reporting extracted to external package

• Removes flow360.plugins.report (all report classes, utilities, assets) and report-related request models; drops implicit report creation in Project.run_case
• Deletes report example scripts and prunes notebook sections; updates remaining examples to note using flow360-report
• Cleans imports/exports referencing report (e.g., flow360/__init__.py); adds flow360.plugins shim that raises a helpful ImportError directing to flow360-report (pip install flow360-report, import from flow360_report.plugins.report)

Scope/Risk

• Import and API breaking changes for reporting; consumers must migrate to the flow360-report package and update import paths

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[benflexcompute]

Let's hold off merge this until E2E works.