Replace instances of renderMultiSelectText with getSelectedOptionsText

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The following discussion from !171359 (merged) should be addressed:

• @aturinske started a discussion: (+1 comment)

  A really great util method; handles all the text logic

Implementation plan

• frontend replace all instances of renderMultiSelectText with getSelectedOptionsText in ee/app/assets/javascripts/security_orchestration/

Support contact: @aturinske

How to test

1. Upload a GitLab Ultimate license
2. Navigate to a project => Secure => Policies
3. Find the dropdown and verify the toggle text works as expected