SPARKNLP-867 Solves multiLabel param issue in ZeroShot annotators

[danilojsl]

Description

Modifies getActivation method to take multilabel into account and added as invocation for each classifier that uses XXXForClassification.predictSequenceWithZeroShot method

Motivation and Context

Solving issue #13881

How Has This Been Tested?

Screenshots (if appropriate):

• Local Tests
• Google Colab notebook

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Code improvements with no or little impact
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING page.
• I have added tests to cover my changes.
• All new and existing tests passed.