Fix react category order of matching axes

[archmoj]

Fixes #4718 and fixes #4826 | before vs after.

@plotly/plotly_js

[alexcjohnson]

💃 Looks good, and for the short term this is probably the safest solution. But my comment about "maybe we can avoid relinking these axes entirely" was sincere - see #749, it's very likely that we're majorly overdoing this, and we'll continue creating new bugs with this step until we identify the specific reason why some keys need relinking, others need to NOT be relinked, and still others don't care. The end result, I suspect, will be an opt-in relink step rather than the current opt-out.

[archmoj]

What is hapening (I think) is that this block

plotly.js/src/plots/cartesian/set_convert.js

Lines 877 to 909 in 4d383f2

	if(matchGroups && matchGroups.length) {
	var found = false;
	for(var i = 0; i < matchGroups.length; i++) {
	var group = matchGroups[i];
	if(group[axId]) {
	found = true;
	var categories = null;
	var categoriesMap = null;
	for(var axId2 in group) {
	var ax2 = fullLayout[axisIds.id2name(axId2)];
	if(ax2._categories) {
	categories = ax2._categories;
	categoriesMap = ax2._categoriesMap;
	break;
	}
	}
	if(categories && categoriesMap) {
	ax._categories = categories;
	ax._categoriesMap = categoriesMap;
	} else {
	emptyCategories();
	}
	break;
	}
	}
	if(!found) emptyCategories();
	} else {
	emptyCategories();
	}

links the matching items and then those would be replaced by the relink function.
I added few more tests in c2dc252.
& merging...