fix(core): refactor internal state listener

[dai-shi]

This is just a refactor of an internal DEV-only function. When we refactored with DEV_GET_MOUNTED_ATOMS, we no longer need to notify each updating state, and it's cleaner and should behave better.

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[github-actions]

Size Change: -81 B (0%)

Total Size: 43.3 kB

Filename	Size	Change
dist/devtools.js	1.69 kB	-47 B (-3%)
dist/esm/devtools.js	1.55 kB	-45 B (-3%)
dist/esm/index.js	5.18 kB	+8 B (0%)
dist/index.js	5.96 kB	+3 B (0%)

ℹ️ View Unchanged

Filename	Size
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