perf: computed signals only trigger when changed

[wmertens]

If a signal changes, all computed signals that use it will trigger their listeners, even if the computed value doesn't change.

This PR makes it trigger only when changed, which is also the behavior of v2.

[changeset-bot]

🦋 Changeset detected

Latest commit: 767c981

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@builder.io/qwik	Minor
eslint-plugin-qwik	Minor
@builder.io/qwik-city	Minor
@builder.io/qwik-react	Major
create-qwik	Minor

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npm i https://pkg.pr.new/create-qwik@8148

commit: 767c981

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[gioboa]

LGTM 👍