test: increase coverage for perf_hooks/Histogram #38555
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custom inspect test case
Refs: https://coverage.nodejs.org/coverage-18e4f405b14b26f9/lib/internal/histogram.js.html#L56
tests that RecordableHistogram is impossible to construct manually
Refs: https://coverage.nodejs.org/coverage-18e4f405b14b26f9/lib/internal/histogram.js.html#L132