[receiver/hostmetrics] Fix calculation of process.cpu.utilization

[antonblock]

Description: Fixes the calculation of process CPU utilization. Rather than using a single ucal.CPUUtilizationCalculator struct to calculate the utilization over the collection interval, maintain one for each PID. After each scrape, remove any entries for PIDs that are no longer present.

Link to tracking Issue: #19119

Testing: Testing was performed manually by exporting to Prometheus, and comparing values to those reported by top on that system at the same time.

Documentation: No documentation was added, apart from the proposed CHANGELOG entry

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⭕  build-and-test-windows workflow has finished in 6 seconds (43 minutes 9 seconds less than main branch avg.) and finished at 1st Mar, 2023.

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✅  load-tests workflow has finished in 7 minutes 13 seconds (10 minutes 31 seconds less than main branch avg.) and finished at 1st Mar, 2023.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 18  ❌ 0  ⏭ 0    🔗	See Details
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 build-and-test workflow has finished in 15 minutes 34 seconds (56 minutes 50 seconds less than main branch avg.) and finished at 1st Mar, 2023.

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Job	Failed Steps	Tests
unittest-matrix (1.20, internal)	N/A	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	N/A	✅ 537  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, internal)	N/A	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	N/A	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, processor)	N/A	✅ 1525  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, extension)	N/A	✅ 537  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	N/A	✅ 1525  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	N/A	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-0)	N/A	✅ 2580  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, receiver-0)	N/A	✅ 2580  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, exporter)	N/A	✅ 2456  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	N/A	✅ 2456  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	N/A	✅ 1937  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, other)	N/A	✅ 4788  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, other)	N/A	✅ 4788  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, receiver-1)	N/A	✅ 1937  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	N/A	✅ 55  ❌ 0  ⏭ 0    🔗	See Details

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✅  e2e-tests workflow has finished in 11 minutes 41 seconds (5 minutes 2 seconds less than main branch avg.) and finished at 1st Mar, 2023.

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Job	Failed Steps	Tests
kubernetes-test (v1.26.0)	-     🔗	N/A	See Details
kubernetes-test (v1.25.3)	-     🔗	N/A	See Details
kubernetes-test (v1.24.7)	-     🔗	N/A	See Details
kubernetes-test (v1.23.13)	-     🔗	N/A	See Details

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[andrzej-stencel]

Thank you for this fix

[dmitryax]

LGTM