[Due for payment 2025-11-21] [$250] Enable prefer-set-size ESLint rule

[roryabraham]

Coming from #67420

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Problem

When Array.from(set).length is used, then a full array is created in memory just to count the number of elements in a set.

Solution

Enable eslint-plugin-unicorn’s prefer-set-size to use set.size, which returns the size directly in constant time without allocation.

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Issue Owner

Current Issue Owner: @zanyrenney

[roryabraham]

https://expensify.slack.com/archives/C05LX9D6E07/p1755719761872409?thread_ts=1755719385.116499&cid=C05LX9D6E07

[roryabraham]

Looking for a team of two volunteers to take this on: https://expensify.slack.com/archives/C08CZDJFJ77/p1756853317764529