[MM-56042] Show full timestamp with seconds in tooltip of post date (#25699)

webapp/channels/src/components/post_view/post_time/post_time.tsx

@@ -18,6 +18,7 @@ const POST_TOOLTIP_RANGES = [
     RelativeRanges.TODAY_TITLE_CASE,
     RelativeRanges.YESTERDAY_TITLE_CASE,
 ];
+const getTimeFormat: ComponentProps<typeof Timestamp>['useTime'] = (_, {hour, minute, second}) => ({hour, minute, second});
 
 type Props = {
 
@@ -105,6 +106,7 @@ export default class PostTime extends React.PureComponent<Props> {
                             value={eventTime}
                             ranges={POST_TOOLTIP_RANGES}
                             useSemanticOutput={false}
+                            useTime={getTimeFormat}
                         />
                     </Tooltip>
                 }