lsp: Remove snippet lies (#13183)

We don't actually support snippets in core in the way that users would
truly expect. So, by default, we will not say that builtin-lsp has
`snippetSupport`.

To re-enable, users can do the following:

First, get a capabilities dictionary with

`local capabilities = vim.lsp.protocol.make_client_capabilities()`

Then override

`capabilities.textDocument.completion.completionItem.snippetSupport = true`

and then pass those capabilties to the setup function.

```
nvim_lsp.server_name.setup {
  ...,
  capabilities = capabilities,
  ...,
}
```

See https://github.com/neovim/neovim/issues/12795

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