feat: Delay icon's caching manager 30s after startup

Icons caching may slow down the startup process but is not necessary
for the app to work

If not called in time, this would only impact cozy-apps opening
animation that will use generic icons (if never called before) or
potentially old icons (in the rare cases when we update a cozy-app
icon)

So we chose to delay this call a short delay after the startup (for now
30s)

src/hooks/useAppBootstrap.js

@@ -25,6 +25,8 @@ import { useHomeStateContext } from '/screens/home/HomeStateProvider'
 
 const log = Minilog('useAppBootstrap')
 
+const MANAGE_ICON_CACHE_DELAY_IN_MS = 30 * 1000
+
 export const useAppBootstrap = client => {
   const [markName] = useState(() => rnperformance.mark('useAppBootstrap'))
   const [initialRoute, setInitialRoute] = useState('fetching')
@@ -176,7 +178,8 @@ export const useAppBootstrap = client => {
       return
     }
 
-    client && manageIconCache(client)
+    client &&
+      setTimeout(() => manageIconCache(client), MANAGE_ICON_CACHE_DELAY_IN_MS)
     client && setSentryTag(SentryCustomTags.Instance, client.stackClient?.uri)
 
     const subscription = Linking.addEventListener('url', ({ url }) => {