Update integrations for "setless" rewrite

[developit]

I've based this off of @jviide's branch so that our size checking and tests run against the whole thing.

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Latest commit: f3c2c19

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[github-actions]

Size Change: +1.39 kB (+2%)

Total Size: 67.4 kB

Filename	Size	Change
docs/dist/assets/client.********.js	45.8 kB	+5 B (0%)
docs/dist/assets/index.********.js	1.08 kB	+3 B (0%)
docs/dist/assets/signals-core.module.********.js	1.46 kB	+475 B (+48%)	🚨
docs/dist/assets/signals.module.********.js	1.96 kB	+17 B (+1%)
docs/dist/demos-********.js	3.35 kB	+1 B (0%)
docs/dist/nesting-********.js	1.13 kB	+1 B (0%)
docs/dist/react-********.js	240 B	+1 B (0%)
packages/core/dist/signals-core.js	1.52 kB	+495 B (+48%)	🚨
packages/core/dist/signals-core.mjs	1.19 kB	+370 B (+45%)	🚨
packages/preact/dist/signals.js	1.13 kB	+11 B (+1%)
packages/preact/dist/signals.mjs	1.12 kB	+4 B (0%)
packages/react/dist/signals.js	834 B	+3 B (0%)
packages/react/dist/signals.mjs	797 B	+6 B (+1%)

ℹ️ View Unchanged

Filename	Size
docs/dist/assets/jsxRuntime.module.********.js	282 B
docs/dist/assets/preact.module.********.js	4 kB
docs/dist/assets/style.********.js	21 B
docs/dist/assets/style.********.css	1.21 kB
docs/dist/basic-********.js	244 B

_{compressed-size-action}

[jviide]

LGTM 👍 Added tests to the setless branch for Effect internals that this integration code depends on.

[marvinhagemeister]

👍