[WIP] Fix violations in opentelemetry-instrumentation-system-metrics package

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Please look at the following report and open a pr to fix the violations listed there in opentelemetry-instrumentation-system-metrics package that is inside the instrumentation dir. On that instrumentation the name of the attributes are taken from the opentelemetry-semantic-conventions package, so you should grep https://github.com/open-telemetry/opentelemetry-python/tree/main/opentelemetry-semantic-conventions/ to get the variable name referenced in the opentelemetry-instrumentation-system-metrics package.

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