fix!: remove deprecated durationMs prop (#577)

- I previously left in `durationMs` for backward-compatibility so that you could use either, but I forgot to mark the types as optional, so both ended up being required by the typings
  - instead of making them both confusingly optional (no way of doing "one of"), just remove the deprecated `durationMs` in another breaking change

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>

src/components/duration.tsx

@@ -6,8 +6,7 @@ import { formatDuration } from '../../v2';
  * Output a string duration from a number of seconds
  *
  * @param {number} props.durationS - The number of seconds.
- * @param {number} props.durationMs - The number of seconds. DEPRECATED: The "Ms" suffix is incorrect, use props.durationS instead.
  */
-export function Duration(props: {durationMs: number, durationS: number}) {
-    return <span>{formatDuration(props.durationMs || props.durationS, 2)}</span>;
+export function Duration(props: {durationS: number}) {
+    return <span>{formatDuration(props.durationS, 2)}</span>;
 }