[r282] backport Fix out of order exemplar error for native histograms pr 7640 #7820
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Port of prometheus/prometheus#13021
When receiving multiple exemplars for a native histogram in mimir via remote write, sort them and only report an error if all are older than the latest exemplar as this could be a partial update.
Signed-off-by: György Krajcsovits gyorgy.krajcsovits@grafana.com
cherry pick from def7165