Add EDOT references and tags across observability documentation

[alexandra5000]

This PR:

• Updates product tags to include 'edot-collector' and 'edot-sdk' in various sections.
• Adds notes and tips regarding the use of the Elastic Distributions of OpenTelemetry (EDOT) Collector and SDKs for enhanced telemetry data collection in mobile and Java applications.
• Updates quickstart guides for monitoring hosts and Kubernetes clusters to include EDOT options.

These changes aim to improve clarity and provide users with alternative solutions for telemetry data collection.

Part of #82

[github-actions]

🔍 Preview links for changed docs

• solutions/observability/apm/apm-server/advanced-setup.md
• solutions/observability/apm/mobile-service-overview.md
• solutions/observability/get-started/other-tutorials/tutorial-monitor-java-application.md
• solutions/observability/get-started/quickstart-monitor-hosts-with-elastic-agent.md
• solutions/observability/get-started/quickstart-monitor-kubernetes-cluster-with-elastic-agent.md
• solutions/observability/infra-and-hosts/get-started-with-system-metrics.md
• solutions/observability/infra-and-hosts/get-started-with-universal-profiling.md

[florent-leborgne]

The note/tip is a good idea 👍 (we could even explicitly say that EDOT is the recommended way if that is ultimately why we're adding these, to not leave users wondering why we're suddenly mentioning this)

On the other hand, I don't think we should be adding edot to the frontmatter's product list for cases where the only edot mention is that it can be used alternatively to what's described on the page (when the page itself isn't about edot or describing something using edot)