fix(ci): restore template repo update

[jycouet]

Closes #

Description

Since #838 the @sveltejs/create package no longer exists, so pnpm -F @sveltejs/create update-template-repo silently matched nothing (exit 0) and kit-template-default stopped being updated on release.

• workflows now run pnpm -F sv update-template-repo, and sv gets that script back
• update-template-repo-contents.js: import create from sv (built output, the ../index.ts import wasn't runnable) and use the current object signature
• fix the tmp dir path after the folder move

Checklist

• Update snapshots (if applicable)
• Add a changeset (if applicable)
• Allow maintainers to edit this PR
• I care about what I'm doing, no matter the tool I use (Notepad, Sublime, VSCode, AI...)

[pkg-svelte-dev]

Install the latest version of sv from b03b403:

pnx https://pkg.svelte.dev/sv/c/b03b403ef0d0ed857ac2b0bd35f435242981b790 create

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/cli/pr/1302

[changeset-bot]

⚠️ No Changeset found

Latest commit: b03b403

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-cli-1302-svelte.vercel.app/