Optimize queries for (non-)empty labels #9966
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What this PR does
Cherry-pick query optimization (mainly for queries involving empty or non-empty labels) prometheus/prometheus#14144. See Prometheus PR for benchmark stats.
Which issue(s) this PR fixes or relates to
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX].about-versioning.mdupdated with experimental features.