Memory test for 1.3 release.

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For #154.

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This sim has a memory leak, probably related to LocalizedStringProperty.

Tested on macOS 14.5 + Chrome 127.0.6533.74
https://phet-dev.colorado.edu/html/balancing-chemical-equations/1.3.0-dev.4/phet/balancing-chemical-equations_all_phet.html?fuzz
Heap snapshots at 1-minute intervals.

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There were several leaks in GameFeedbackPanel, all related to LocalizedStringProperty, that were fixed in 6777d55.

I don't see any other Text or RichText nodes that require disposal, as they are all associated with Nodes that are isDisposable: false. Ditto for ProfileColorProperty.

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Tested on macOS 14.5 + Chrome 127.0.6533.74
https://phet-dev.colorado.edu/html/balancing-chemical-equations/1.3.0-dev.5/phet/balancing-chemical-equations_all_phet.html?fuzz
Heap snapshots at 1-minute intervals (numbered 2-11).

Memory leaks are resolved. The heap size stabilizes at ~54 MB.

I'll leave this issue open for verification during the QA process.

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It's been awhile, and QA usually does memory tests. So I'm going to close this issue.