* MM-16442: leverage post hasReactions utils function
This handles backwards compatibility with servers that do not have post
metadata, allowing the client to detect the presence of reactions that
in turn might need to be loaded when the component is mounted.
* temporary mattermost-redux commit for testing
* revert usage of hasReactions, and count directly
We still fallback to has_reactions if set, in case we're connected to a server without post metadata.
* revert mattermost-redux changes