feat: update workflow step action types [HOMER-612] (#1234)
feat: update workflow step action types [HOMER-612] (#1234)

* feat: update workflow step action types

* feat: update workflow step action types

* chore: code review

* fix: make body and headers optional

* refactor: use union for action types

* chore: rename types

* fix: config should be optional only for app

* fix: header value is string
contentful/contentful-management.js,contentful/contentful-management.js