Memory testing (brand=phet-io)

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Test platform: macOS 12.2.1, Chrome 99.0.4844.51, MacBookPro16,1

Testing was done with a local build grunt --minify.mangle=false --brands=phet-io that has identical shas with 1.1.0-dev.37.

Stanalone PhET-iO sim was run from the Wrapper Index using local URL:
.../geometric-optics/build/phet-io/geometric-optics_all_phet-io.html?postMessageOnError&phetioStandalone&fuzz

Heap snapshots:

Snapshot 1 was taken immediately after starting the sim with no query parameters. It's the baseline memory footprint.

Snapshots 2-11 were taken at 1-minute intervals, running the sim with ?fuzz, similar to the testing procedure described in the QA Book.

Snapshot 12 was taken 10 minutes after Snapshot 11, to test the sim's memory consumption over a longer period of time.

Conclusions:

• Results are similar to brand=phet in Memory testing (brand=phet) #372.
• Heap size stablized ~58MB.
• Heap size decreased between some snapshots.
• There is no indication of memory leaks.

I'll leave this issue open so that it can be referred to during the QA process.

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Now that this issue is referenced in #374, I'm going to close this issue.