[coordinator] Use table based approach for aggregation tile buffer past calculation #1717
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What this PR does / why we need it:
This fixes a relatively unreasonable default of only 10% of tile size for the aggregation buffer past value. Table based approach allows for some reasonable defaults, the observed delay from Prometheus remote write seems to be under 15seconds when it's healthy (not 5s like the current clamp minimum).
Special notes for your reviewer:
Does this PR introduce a user-facing and/or backwards incompatible change?:
Does this PR require updating code package or user-facing documentation?: