fix(tracemetrics): Prevent header text wrapping in samples table during loading (#112576)

Fix styling issue where `Trace ID` column, was being line wrapped on
load.

Author: nsdeschenes

static/app/views/explore/metrics/metricInfoTabs/metricInfoTabStyles.tsx

@@ -74,6 +74,7 @@ export const StyledSimpleTableHeaderCell = styled(SimpleTable.HeaderCell)<{
   noPadding?: boolean;
 }>`
   font-size: ${p => p.theme.font.size.sm};
+  white-space: nowrap;
   padding: ${p => (p.noPadding ? 0 : p.embedded ? p.theme.space.xl : p.theme.space.lg)};
   padding-top: ${p =>
     p.noPadding ? 0 : p.embedded ? p.theme.space.sm : p.theme.space.xs};