Stop implicitly emitting deprecated process runtime metrics

[alexmojaki]

Builds on #930

These are breaking changes that should be included in the next major release.

[hyperlint-ai]

PR Change Summary

Updated system metrics instrumentation to stop emitting deprecated process runtime metrics and simplified metric naming.

• Replaced deprecated metric 'process.runtime.cpu.utilization' with 'process.cpu.utilization'.
• Removed deprecated metrics related to process runtime memory and CPU time.
• Clarified documentation regarding the metrics and their configurations.

Modified Files

• docs/integrations/system-metrics.md

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[alexmojaki]

I'll resolve merge conflicts after the base gets merged, or maybe not at all until we want to make a major release.