Audit Console for concrete dependencies on elasticsearch config

[cjcenizal]

Currently, the legacy Console plugin consumes server.newPlatform.__internals.elasticsearch.legacy.config$ and exports the first emitted value. The NP version of Console consumes this value (a config object) and consumes it internally. We need to audit the specific dependencies upon this config object to help the Platform team provide a NP alternative.

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[jloleysens]

The values required by Console from the legacy are the diff between what we get from:

ESConfigForProxy (src/plugins/console/server/types.ts) and SharedGlobalConfigKeys['elasticsearch'] (src/core/server/plugins/types.ts).

Concretely:

interface ValuesFromLegacy {
  hosts: string[]; // 👈🏻Configured host nodes for Kibana
  // 👇🏻Lower level values used for building the request to be proxied and injecting headers
  requestHeadersWhitelist: string[];
  customHeaders: Record<string, any>;
  ssl?: {
    verificationMode: 'none' | 'certificate' | 'full';
    certificateAuthorities: string[] | string;
    alwaysPresentCertificate: boolean;
    certificate?: string;
    key?: string;
    keyPassphrase?: string;
  };
}

[cjcenizal]

Resolved by #75406