This rule warns us if an element has an onMouseOver/onMouseLeave
attributes without corresponding onFocus/onBlur ones. It's helpful
for showing where we may be missing some accessible interactions,
and I've filed MM-62343 and MM-62345 to follow up on two of these.
In other cases, the component either has alternate accessibility support
(the emoji picker), it's something that may not make sense to be
accessible (the expanded view of the channel header), or something we're
already planning to review accessiblity for (the search component), so
I'm going to disable it to avoid introducing noise for the time being.
3c88f6695e