fix: remove bindable prop validation

[Rich-Harris]

Possible alternative to #13416

closes #13368

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[fasterthanlime]

I'm fairly sure that this broke vite-plugin-svelte — they depend on an older svelte compiler, which still generates the calls to $.validate_prop_bindings, resulting in errors like $.validate_prop_bindings is not a function (Something that had zero web search results until my comment 🙃)

❯ npm ls svelte -a
fasterthanli-me@1.0.0 /Users/amos/bearcove/fasterthanli.me
├─┬ lithkit@1.0.0 -> ./../lithkit
│ └─┬ @sveltejs/vite-plugin-svelte@5.0.3
│   ├─┬ @sveltejs/vite-plugin-svelte-inspector@4.0.1
│   │ └── svelte@5.0.3 deduped
│   └── svelte@5.0.3
└── svelte@5.20.4

I'm going to look into opening a PR to vite-plugin-svelte, but it would be nice to do synchronized releases of bundler pulgins when changing the internals in a non-backwards compatible way like this.

Afaict this broke in a minor version, I couldn't find any trace within the changelog, I spent hours tracking it down and getting rid of dependencies I thought were shipping pre-built Svelte components. (Although there are such dependencies out there and they will break as well.)

---

On second thought this went out as 5.17.1 on Jan 8... has nobody else really noticed anything for 49 days?

Edit 2: no PR needed, the vite-plugin-svelte repo already depends on a recent enough svelte, it just needs a release to be cut.

Edit 3: opened sveltejs/vite-plugin-svelte#1090 to request a publish/release — sorry for the noise here.