Avoid closing System.out after All-Users GC in NoteDB migration
By using try-with-resource wrappers around System.out for the garbage
collection of the All-Users repo, System.out got closed when the
wrappers got closed after the garbage collection. Due to the closed
System.out, the final status messages of the migration got swallowed
and did not make it to the screen.
We no longer close the wrappers to keep System.out open.
Bug: Issue 12935