fix(query) Long lookback queries with or vector() operations fail to materialize

[amolnayak311]

Queries like sum(rate(foo{}[long look back])) or vector(0) fail to materialize. This is a BinaryJoin with rhs having a ScalarFixedDoublePlan. Long time range planner for long lookbacks exceeding raw cluster retention get pushed down to downsample cluster and changes the end time. Following code in LongTimeRangePlanner specifically did this update to end time

copyLogicalPlanWithUpdatedTimeRange(periodicSeriesPlan,
          TimeRange(periodicSeriesPlan.startMs, latestDownsampleTimestampFn + offsetMillis.min))

The issue however comes from the fact that ScalarFixedDoublePlan uses seconds precision but lhs of the BinaryJoin stores the milliseconds for end time without truncation which causes the assertion in BinaryJoin to check the end date to fail.

Since latestDownsampleTimestampFn is the latest downsample time in milliseconds and we support a minimum granularity between samples to a second, we truncate this time to latest second dropping the 1/1000th seconds .

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