Optimistic Mutation in a list

[jycouet]

Fixes #960

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[changeset-bot]

🦋 Changeset detected

Latest commit: 132aae1

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

This PR includes changesets to release 4 packages

Name	Type
houdini	Patch
houdini-plugin-svelte-global-stores	Patch
houdini-react	Patch
houdini-svelte	Patch

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