fix: memory leak operation loop - WPB-18909

[netbe]

WPB-18909 [iOS] ZMUserSession is still retained in memory after logout

Issue

When the user logs out the ZMUserSession is still retained in memory. Looking at it, the operation loop still waits for all dispatch groups to be empty. Not sure exactly sure why there are so much blocks left and why they can't be executed.

It would appear that there are 2 pending save (enqueueDelayedSaved)

Solution:
Disable the enqueuDelayedSaved when logging out

• Add debug action to logout without password

Testing

1. login
2. logout
3. check memory

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Checklist

• Title contains a reference JIRA issue number like [WPB-XXX].
• Description is filled and free of optional paragraphs.
• Adds/updates automated tests.

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