telemetryCollectionManager to use X-Pack strategy as a replacement of the OSS strategy

[afharo]

As part of the decoupling process of Telemetry & Monitoring, and after #82638 is completed, we need to change the way the telemetryCollectionManager currently works: At the moment, it loops through a priority-based list of strategies until it gets any results.

This comes with the risk of the X-Pack strategy failing for any glitch and the collection manager would fallback to the OSS strategy. This is forcing the OSS to be aware of X-Pack features in order to provide the expected results (i.e.: OSS attempts to collect the license information, even when OSS does not have any license information at all #82963).

This issue is to change this behaviour and let the telemetryCollectionManager to use the X-Pack strategy to overwrite the OSS one instead of using both as fallbacks.

[elasticmachine]

Pinging @elastic/kibana-telemetry (Team:KibanaTelemetry)

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)