Split concatenated namespaces #2058
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Split pipe-concatenated namespace regex (e.g., ns=~"nsA|nsB|nsC") using QueryUtils.splitAtUnescapedPipes:
Single value -> Equals("nsA")
Multiple values -> In(Set("nsA","nsB","nsC"))
Per-namespace attribution: when In(...) is present, build a metric group-by per namespace and increment counters accordingly (timeSeriesScanned, cpuNanos; preserves existing behavior elsewhere).