fix(kit,shared): mark packages side-effect-free for treeshaking

[danielroe]

follow-on from #795, this applies sideEffects: false for two other packages.

noticed this in a bundle-size increase when migrating to vite 8 in nuxt/nuxt#35439.

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commit: 953e71e

[webfansplz]

Thanks. I’ll release a patch version for this.

[danielroe]

thank you 🙏

[skirtles-code]

If this is being pulled in via @vue/devtools-api, would it need a v7 release too?

[webfansplz]

Released in v7.7.10 and v8.1.4