DRYD-1193: Sysinfo endpoint healthcheck

[mglyrasis]

What does this do?
Adds a health check endpoint at /health that returns JSON describing the health status. Makes a very basic attempt at determining which data sources matter and degrades to a warning state if non-required components fail.

{
  "checks":{
    "database:cspace":{
      "componentType":"datastore",
      "status":"pass",
      "observedValue":"PostgreSQL 17.5 (Debian 17.5-1.pgdg120+1)"
    },
    "database:csadmin":{
      "componentType":"datastore",
      "status":"pass",
      "observedValue":"PostgreSQL 17.5 (Debian 17.5-1.pgdg120+1)"
    },
    "database:nuxeo:default":{
      "componentType":"datastore",
      "status":"pass",
      "observedValue":"PostgreSQL 17.5 (Debian 17.5-1.pgdg120+1)"
    },
    "nuxeo:repository":{
      "componentType":"component",
      "status":"pass",
      "observedValue":"default"
    },
    "database:nuxeo_reader:default":{
      "componentType":"datastore",
      "status":"pass",
      "observedValue":"PostgreSQL 17.5 (Debian 17.5-1.pgdg120+1)"
    },
    "database:csadmin_nuxeo:default":{
      "componentType":"datastore",
      "status":"pass",
      "observedValue":"PostgreSQL 17.5 (Debian 17.5-1.pgdg120+1)"
    },
    "elasticsearch":{
      "status":"disabled"
    }
  },
  "description":"CollectionSpace Services",
  "version":"8.3.0-RC.2",
  "releaseId":"99cd743",
  "serviceId":"_collectionspace",
  "status":"pass"
}

Why are we doing this? (with JIRA link)
https://collectionspace.atlassian.net/browse/DRYD-1193

Because hosting needs a way to determine if there's a failure communicating with the database or ElasticSearch.

How should this be tested? Do these changes have associated tests?
Bundled integration tests.

Dependencies for merging? Releasing to production?
No additional dependencies.

Has the application documentation been updated for these changes?
No.

Did someone actually run this code to verify it works?
Yes.