"Best Time" was removed from level-selection buttons in several sims.

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Over in phetsims/reactants-products-and-leftovers#95 (comment), QA identified that the "best time" no longer appears below the level-selection buttons in the Game screen. Further investigation revealed that "best time" was removed entirely from LevelSelectionButton in #120, and the commits therein indicate that the following sims have this regression:

• arithmetic
• balancing-chemical-equations, "Best Time" was removed from level-selection buttons balancing-chemical-equations#163
• build-an-atom
• fractions-common (MatchingGameScreenView, used in fractions-equality, fraction-matcher)
• graphing-lines, graphing-slope-intercept, "Best Time" was removed from level-selection buttons graphing-lines#160
• reactants-products-and-leftovers, "Best Time" was removed from level-selection buttons reactants-products-and-leftovers#95

First we test the above sims, and create sim-specific issues if they are indeed broken.

Second we should determine what the plan is for restoring this feature.

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I've tested the sims that I'm responsible for, and they are broken. I created sim-specific GitHub issues, noted in the checklist above.

@KatieWoe or @Nancy-Salpepi would you have time to check the remaining sims in the checklist above? You can test in main. If they have this problem, please create a GitHub issue similar to phetsims/balancing-chemical-equations#163.

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@KatieWoe @Nancy-Salpepi — please hold off until @marlitas and I discuss. Re-reading #120 (where the work was done) it seems like there was a decision (in #120 (comment)) that we no longer need to display best time with the level-selection buttons. If that’s the case, and it’s OK only to display best time when a level is completed, than this may be a “won’t fix” issue.

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According to #120 (comment), it was an intentional design decision, made by a quarum of designers and developers, to remove the "best time" display from LevelSelectionButton specifically and the level-selection user-interface in general. So closing this issue as "won't fix".