Fix/14992 EOL - Remove notifications syncronously

[30mar]

Description

• When we reach EOL and try to close the app we try to cancel notifications in an async method, this wont work properly as the app will be removed from memory before the async block is reached and the notifications are canceled
• the solutions is to call UNUserNotificationCenter.current().removeAllPendingNotificationRequests() which will do the same but synchronously.
  The downside of reverting the previous code:
  We wont be able to stop notifications in the future if the EOL is not reached yet. e.g today is 3/4/2023 Eol is 4/4/2023 and we have a notification scheduled in 5/4/2023. this notification will not be canceled unless the user tries to open, close, of move the app to background DURING End of life.

a redundant call was removed from applicationDidEnterBackground() as we will cancel anyway in applicationWillResignActive() which has to be called before applicationDidEnterBackground, so need to cancel twice

Link to Jira

https://jira-ibs.wbs.net.sap/browse/EXPOSUREAPP-14992

[flxschmidt]

For me that's completely fine, as discussed.