Add unit test to compare histogram_quantile results with and without query sharding #6525
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What this PR does
Adds a unit test from #6504 to ensure that the results from
histogram_quantilewith and without query sharding have no significant differences. Before the fix in prometheus/prometheus#13153 was vendored in #6766 , this unit test failed, now it passes.Context: Mimir had a bug that sometimes occurs when summing (or other aggregation) the classic histogram (separate series per bucket) input into
histogram_quantile, when query sharding on the input results in reduced precision which is normally insignificant, but may result in non-monotonicity in the histogram buckets.Which issue(s) this PR fixes or relates to
N/A
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]