Fix stuff happening based on timers not being run correctly in unit tests (#5764)

* Introduce helper for advancing fake time

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Introduce reactive now to kludge around global shared state in library

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Replace all usages of "now" from mobx-utils with our own kludge to get rid of shared global state between unit tests

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Consolidate all usages of advanceTimersByTime to make sure things happening based on timers are run correctly

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Fix incorrect expect in test

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Enable skipped unit test since prerequisites are done

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

src/renderer/components/duration/reactive-duration.tsx

@@ -4,9 +4,9 @@
  */
 
 import { observer } from "mobx-react";
-import { now } from "mobx-utils";
 import React from "react";
 import { formatDuration } from "../../utils";
+import { reactiveNow } from "../../../common/utils/reactive-now/reactive-now";
 
 export interface ReactiveDurationProps {
   timestamp: string | undefined;
@@ -42,7 +42,7 @@ export const ReactiveDuration = observer(({ timestamp, compact = true }: Reactiv
 
   return (
     <>
-      {formatDuration(now(computeUpdateInterval(timestampSeconds)) - timestampSeconds, compact)}
+      {formatDuration(reactiveNow(computeUpdateInterval(timestampSeconds)) - timestampSeconds, compact)}
     </>
   );
 });