chore: remove options.uid in render()

[adiguba]

When I write #15185 I have added an options on the render() function, allowing to pass a custom uid-generator.

I totally forgot to mention it on the PR, and now I think that it is useless and should not be there.

This option is not documented and not declared in typescript definition of render().
So I think it's better to remove it.

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[github-actions]

Playground

pnpm add https://pkg.pr.new/svelte@15302

[paoloricciuti]

Despite it not being public API I think we still need a change set for this then we are good to go

[changeset-bot]

🦋 Changeset detected

Latest commit: 3b344a8

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

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svelte	Patch

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[adiguba]

Done ;)