[Discover] Add contextual awareness resolution results to EBT telemetry events

[kertal]

📓 Summary

To allow better and more granular telemetry analysis about the contextual resolution in Discover, Event-Based-Telemetry (EBT) events context should be extended by a new property called discover_profiles or discover_context. This property will contain an array of active profiles, e.g. observability-root, logs-data-source (or root-observabilty, data-source-logs), allowing to get insights in which discover context other EBT events like click are logged.

What we intend to log is

• Root Context
• Data Source Context

What is currently out of scope

• Document Context (they are not global values like the other profile types)

More infos about how to extend EBT context can be found here

https://docs.elastic.dev/telemetry/collection/event-based-telemetry#adding-context-to-the-event

✔️ Acceptance criteria

• Extend EBT Based Telemetry by Contextual Awareness Data, logging Root & Data Source Context (when available)
• Aim to keep the extension simple, by using just a single property, because "Note that currently, the context is attached to all events, which means we have to be extra careful polluting abusing this feature"

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)