BUG: Status Report is showing a message count from ElasticPress.io when not using ElasticPress.io

[JakePT]

Describe the bug

The Status Report page is supposed to show messages from an EPIO endpoint, and count indicating the number of messages is displayed next to the admin menu item. The problem is that a message count is being showing for non-ElasticPress.io users, as the error response when checking for messages is being counted as messages.

The ElasticPressIo::get_endpoint_messages() method needs to be updated to not bother making the request is Utils\is_epio() is false, and to ignore non-200 responses.

Steps to Reproduce

1. Connect ElasticPress to self-hosted Elasticsearch.
2. Go to ElasticPress > Status Report. No messages will be displayed, but a count will be shown next to the admin menu item.

Screenshots, screen recording, code snippet

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Environment information

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WordPress and ElasticPress information

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Code of Conduct

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