[internal/comparetest] Sort resource metrics by attributes

[dmitryax]

Sort ResourceMetrics by attributes using the new map hash function. It brings the sorting behavior to consistency with the sorting of ScopeMetrics.

This change also applies a correction to the TestCompareMetrics/ignore-one-resource-attribute-multiple-resources test case. It is used to compare several ResourceMetrics with the same resource attributes relying on a different number of datapoints synthetically adjusted to have a deterministic order with the existing logic, but the different number of datapoints is not a real scenario in any of the existing scraping receivers. This change simplifies the actual/expected test datasets to have different attributes for each ResourceMetrics instance.

Depends on #17169

[dmitryax]

@djaglowski PTAL whenever you have a chance

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test-windows duration(4 seconds) has decreased 43 minutes 35 seconds compared to main branch avg(43 minutes 39 seconds).

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⭕  changelog workflow has finished in 4 seconds (8 minutes 58 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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⭕  build-and-test-windows workflow has finished in 4 seconds (43 minutes 35 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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✅  check-links workflow has finished in 48 seconds (2 minutes 43 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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✅  build-and-test workflow has finished in 43 minutes 43 seconds (16 minutes 14 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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✅  load-tests workflow has finished in 9 minutes 1 second (8 minutes 28 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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✅  prometheus-compliance-tests workflow has finished in 13 minutes 42 seconds (⚠️ 3 minutes 43 seconds more than main branch avg.) and finished at 20th Dec, 2022.

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