fix: memory leaks in store2

[dai-shi]

close #2477

• store2: reproduce the problem in tests
• store2: refactor to avoid .s
• store2: move "dependents" set into Mounted (like store.ts)
• store2: see if it can be refactored more for readability

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Size Change: +1.13 kB (+1%)

Total Size: 91.3 kB

Filename	Size	Change
dist/experimental.js	4.57 kB	+281 B (+7%)	🔍
dist/system/experimental.development.js	3.72 kB	+311 B (+9%)	🔍
dist/system/experimental.production.js	2.03 kB	+140 B (+7%)	🔍
dist/umd/experimental.development.js	4.66 kB	+281 B (+6%)	🔍
dist/umd/experimental.production.js	2.68 kB	+121 B (+5%)	🔍

ℹ️ View Unchanged

Filename	Size
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dist/system/index.production.js	182 B
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dist/umd/babel/plugin-debug-label.production.js	855 B
dist/umd/babel/plugin-react-refresh.development.js	1.28 kB
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dist/umd/vanilla.production.js	2.79 kB
dist/umd/vanilla/utils.development.js	5.99 kB
dist/umd/vanilla/utils.production.js	3.71 kB
dist/utils.js	246 B
dist/vanilla.js	5.1 kB
dist/vanilla/utils.js	5.86 kB

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