Fix WF state propagation on partition verification

[ramonski]

Description of the issue/feature this PR addresses

This PR fixes the WF state propagation on the parent sample in the following setup:

• Sample consists of two partitions
• First sample was verified and published (all Analyses are in published state)
• Second sample was verified (all Analyses are in verified state)

The guard currently disallows the verify transition of samples, if not all contained analyses are in the state verified.

However, since we allow partitions, the contained Analyses might be partially in the state published as well.

Current behavior before PR

Parent Sample is stuck in the to_be_verified state

Desired behavior after PR is merged

Parent Sample is transitioned to the verified state automatically and can be published later explicitly.

--
I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.

[xispa]

Good point!
@xispa , would be nice to have a test for this specific use case, though