[8.4] [ML] Adding a known issue for the ML datafeed auth header problem #92324
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Due to #41185 datafeeds created prior to 7.0 and not updated since then have unparseable authorization headers in 8.x. In 8.0-8.3 this could easily be a non-issue, as such datafeeds were likely forgotten leftovers and never run. Even if it was a problem, only the datafeed of interest would need updating with any urgency.
Due to #87884 datafeeds with authorization headers older than 7.0 prevent all datafeeds being listed in 8.4 and 8.5. This in turn breaks the anomaly detection job management section of the ML UI.
The problem is alleviated by #92168 and fixed by #92221, but we should warn users that the problem exists in 8.4.0-8.5.3 inclusive.
Backport of #92274