* fix(dashboard): pie panel collapses multi-column clickhouse scalar to one slice
A pie panel backed by a ClickHouse query with several aggregations
(e.g. `count() AS col1, sum() AS col2`) rendered a single slice labelled
with the query name and only the first value column's value; the other
value columns were silently dropped.
Root cause: the scalar response carries every value column in the scalar
table, but PiePanelWrapper read the legacy `data.result` time-series field
instead. For a scalar that field collapses to a single series that keeps
only the first value column, so the pie never saw the rest. This is the
pie counterpart of the table collapse fixed in #11794.
Fix: when the scalar table has more than one value column, build pie
slices from the scalar table under `newResult` (the same source the table
and value panels already use) — one slice per value column, group-by
columns become the label. Single-aggregation and grouped pies keep the
existing series path unchanged. Frontend-only, V1.
* fix: formatter datetime
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Co-authored-by: Ashwin Bhatkal <ashwin96@gmail.com>
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