Remove obsolete cloud_optimized_index configuration

[shaunahu]

What

Removes the elasticsearch.cloud_optimized_index property, which nothing uses any more:

• Dockerfile: drop -Delasticsearch.cloud_optimized_index.name=${CO_INDEX_NAME}.
• server/src/main/resources/application.yaml: drop the cloud_optimized_index block.
• BaseTestClass:
  • drop the two @Value fields bound to it;
  • drop the data_index_schema.json test index;
  • drop insertJsonToElasticCODataIndex(), which has no callers.

Why

• The es-coindexer-<env> index used to hold cloud-optimised data points for the hexbin layer.
• PMTiles replaced it (#8430), and es-indexer removed IndexCloudOptimizedService (#8789). Nothing writes the index now.
• On main, ogcapi-java only bound the property; no production code read it. FeatureId.summary has no handler, so items/summary already returns 501.

Testing

• ElasticSearchTest (mocked): 10 of 10 pass locally, and the test sources compile.
• The Testcontainers integration tests (everything extending BaseTestClass) can't start Elasticsearch on my machine, so I'm relying on CI for them. initSchemas() now creates two test indexes instead of three.

Follow-ups (not in this PR)

• Deploy config: CO_INDEX_NAME may still be set in the deploy config (aodn/appdeploy). That's harmless now, but it can be removed.
• es-indexer: it still ships stacmodel/src/main/resources/schema/data_index_schema.json, and nothing loads it after this change.

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