Fix multiversion test failure - merge 2.1.x

[bogniq]

Change Description

The multiversion unit test is fixed to resolve occasional test failures, which mainly occurred at three checking points:

1. Nodes are not in sync before preactivation after the testing cluster is launched. To fix this, areNodesInSync method adds a waiting time when checking if nodes are in sync.
2. 1st node should contain PREACTIVATE FEATURE after the 1st node tries to activate preactivate feature. The fix adds retries to activate the feature and then check its status.
3. 1st node should be out of sync with the rest nodes after the 1st node has activated the preactivate feature. This is fixed by not resuming (and then re-pausing) all nodes until the sync check is finished.

Thank @brianjohnson5972 for the help.

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