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 introduced new metric names for clarity.

• Replaced deprecated metric 'process.runtime.cpu.utilization' with 'process.cpu.utilization'.
• Removed deprecated metrics related to process runtime from the instrumentation configuration.
• Clarified documentation regarding the metrics and their values.

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.

[Copilot]

Pull Request Overview

This PR removes deprecated process runtime metrics from the default system metrics configuration and replaces them with their newer equivalents. This is part of a major release breaking change to align with OpenTelemetry standards.

• Removes deprecated process.runtime.* metrics from default configurations
• Replaces deprecated metrics with their modern equivalents (e.g., process.runtime.cpu.utilization → process.cpu.utilization)
• Maintains backward compatibility by allowing deprecated metrics to be explicitly requested

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
logfire/_internal/integrations/system_metrics.py	Removes deprecated metrics from type definitions and configurations, adds logic to explicitly exclude them from FULL_CONFIG
tests/otel_integrations/test_system_metrics.py	Updates test expectations to reflect removal of deprecated metrics and adds test for explicit deprecated metric usage
docs/integrations/system-metrics.md	Updates documentation to remove references to deprecated metrics and simplify explanations

Comments suppressed due to low confidence (2)

tests/otel_integrations/test_system_metrics.py:72

• The test only verifies that the deprecated metric name is collected, but doesn't verify the actual metric functionality or values. Consider adding assertions to verify the metric produces expected values.

    logfire.instrument_system_metrics({'process.runtime.cpu.utilization': None}, base=None)  # type: ignore