text: Title: The Actions terminology in the code has diverged from the terminology we use verbally and in the UI
  Body: This issue covers the last part of https://github.com/elastic/kibana/issues/90375 for the new rule terminology. We should go through our codebase and change it to reflect the new terminology of connector.
  
  This is also a step towards addressing  https://github.com/elastic/kibana/issues/69442
  
  Align the terminology in the code with the terminology we use externally and in the UI by changing "Actions" to "Connectors". This isn't a whole sale find-and-replace, as we'll still have an Actions feature, client etc. But we'll separate between the Connector entity and the Action entity as they are treated differently in the UI.