Test LTS instance upgrade from n-1 minor version (hotfix) with data

Following NXP-32058, let's do some more advanced testing of an LTS instance upgrade:

• Launch an LTS instance, version N-1, configured to persist the data directory
• Import some relevant data, to be defined
• Stop the instance
• Upgrade the instance from N-1 to N
• Start the instance
• Validate that everything is working as expected

This could be achieved by a new pipeline, or another (sub-)stage in the main build pipeline, and will add a new required GitHub status. It will be launched on reference branches and PRs, maybe conditioned by a label.

The target deployment, as for NXP-32058, is the default Cloud environment:

• MongoDB
• Kafka
• Opensearch/Elasticsearch

We could leverage the idea of the nuxeo-server-integration-tests repository from NXP-29353 and add a new folder for this upgrade test.