* fix: the publish action should use the publish modal
* feat: allows the publish modal to handle invariant data
* chore: rearrange the unpublish action & modal so they are one-for-one alike with publishing
* Updated acceptance tests - add steps to interact with publish modal
* Added tests for publish variant content
* Bumped version of test helper
* feat: adds text to indicate you are about to publish
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Co-authored-by: Nhu Dinh <hnd@umbraco.dk>
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