bucket notification - ensure all lines in a persitent log are processed (gh issue 8653)

[alphaprinz]

Explain the changes

1. Wrap a single line of the notification persistent log in a try/catch.
   If a single line fails, we will still process the rest of the file.

Issues: Fixed #xxx / Gap #xxx

1. If connection fails for the first few events it fails for others as well in the events.log file #8653

Testing Instructions:

1. Create two notifications.
2. Change the name of the connection of the first notification in the log file to a non-existing connection file.
3. Run notification nsfs cli
4. The first notification goes on to a failure notification log. The second notification is sent.

• Doc added/updated
• Tests added