[REFACTOR] Fetch BPMN diagrams in projects instead of bundling them with the JS code

[tbouffard]

Currently. the BPMN diagrams are stored as string within the JS bundles. This increases the size of the bundle and does not reflect what an application generally does: it doesn't store the diagrams that are retrieved from services or API.

See also

• [REFACTOR] Fetch BPMN diagrams in projects instead of bundling them with the JS code bonita-day-demo-2023#110
• [REFACTOR] Fetch BPMN diagrams in projects instead of bundling them with the JS code bpmn-visualization-examples#502