Send data to Pillarbox QoS backend

[defagos]

As a Pillarbox QoS backend developer I need to receive QoS data from Pillarbox player so that I can create dashboards based on real data.

Acceptance criteria

• Metrics data associated with SRG SSR content is visible on Pillarbox metrics dashboards.

Tasks

• Associate instances with SRG SSR content, sending data to the official endpoint.
• Ensure QoS trackers can never be disabled by enabling the corresponding flag (Add mandatory tracker support #926).
• Remove explicit link with PillarboxMonitoring from demo target.
• Update Monitoring documentation to mention links to our Pillarbox monitoring platform repository / documentation.