Verify compact OTLP histograms where consecutive empty buckets are collapsed

[mcculls]

Motivation

The Java SDK exports OTLP histograms in a compact form where consecutive empty buckets are collapsed into a single bucket using the last boundary. This saves bandwidth when exporting histograms that have lots of explicit boundaries, but only a few of them have counts.

Changes

Creates a new assert_histogram_buckets method that correctly validates both non-compacted and compacted histogram buckets.

Also fixes an issue in the original test where the aggregation_temporality parameter was not actually tested due to shadowing.

Workflow

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Reviewer checklist

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[github-actions]

CODEOWNERS have been resolved as:

tests/parametric/test_otel_metrics.py                                   @DataDog/system-tests-core @DataDog/apm-sdk-capabilities

[datadog-official]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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[chatgpt-codex-connector]

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