feat: add tooltip for full metric names

[etr2460]

🏆 Enhancements

Adds a tooltip to the metric name so that if it overflows the container we can still read it.

Test plan:
CI. new unit test, test in superset

to: @pkdotson @ktmud @graceguo-supercat

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  Coverage          ?   27.80%           
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  Files             ?      453           
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  Hits              ?     2531           
  Misses            ?     6382           
  Partials          ?      191           

Impacted Files	Coverage Δ
...-ui-chart-controls/src/components/MetricOption.tsx	56.25% <ø> (ø)

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[ktmud]

Looks like a reasonable change. We already have tooltips in the Dataset panel.

Although I'm personally a little more in favor of using html title attribute over tooltips for text cutoffs, especially when most of the time the text can be fully displayed. It'd be a little distracting seeing too many tooltips popping out when you move your mouse.

[etr2460]

@ktmud in general i'd agree with using the title attribute, but i've always found it so infuriating that it takes ~1 second for the tooltip to actually display on hover. Since we have tooltips everywhere else already (including on ad hoc metric names, this is only for saved metrics) i'm going to stick with this for now.